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Theta Theory and Argument Structure in Kambari: A Government and Binding Approach

Cite this article as: Dantata, A. I., & Abdulsalam, S. (2025). Theta theory and argument structure in Kambari: A Government and Binding approach. Sokoto Journal of Linguistics and Communication Studies (SOJOLICS), 1(2), 51–59. https://www.doi.org/10.36349/sojolics.2025.v01i02.006

THETA THEORY AND ARGUMENT STRUCTURE IN KAMBARI: A GOVERNMENT AND BINDING APPROACH

By

Aliyu Ibrahim Dantata

aiidantata@gmail.com

Department of English, Faculty of Languages and Communication Studies

Ibrahim Badamasi Babangida University, Lapai

&

Salima Abdulsalam

ummuameer2014@gmail.com

Federal Polytechnic Bida, Niger State.

Abstract

The focus of this paper is to give an overview of Theta Theory outlined in GB framework developed by Chomsky (1981, 1986) and subsequent works with particular reference to Kambari data within the confines of Chomsky’s Government-Binding Theory (1981, 1986) and Grimshaw’s (1990, 1991) Argument Structure. In numerous works over the past decades, most studies on this aspect focused on assignment of Theta roles to arguments in different languages, but putting Kambari language into consideration has not been done to the best of my knowledge. The study is qualitative and uses introspection in analysing the data. Theta Theory, as one of the essential aspects of formal linguistics, is identified to be the guiding theoretical framework in this paper, and it helped to identify some of the core principles of Universal Grammar. The theory was adopted for its concise explanation for the structural relationship that holds between verbs and their arguments in Kambari sentence formation. This paper identifies and further describes the most basic thematic relations encoded in various theta roles with respect to Kambari data. The paper further observed that aspects of the syntactic behaviour of verbs are tied to their meaning in Kambari. The findings reveal that thematic roles are assigned to arguments based on the thematic hierarchy encoded in the language (Agent, Patient, Theme, etc) and that two thematic roles of Agent/Source can be assigned to an argument in Kambari – not necessarily conforming to the Theta Criterion in English.

Keywords: Theta Criterion; Thematic Hierarchy; Theta Grid; Thematic Roles; Argument Structure

1. Introduction

This paper examines the aspect and operation of the theta theory in Kambari sentences as an instantiation of its universal role. TheKambari language cluster is located in the northern part of Nigeria’s Middle Belt near the western boarder of Nigeria, particularly in Niger State and part of Kebbi State. The cluster is classified as Niger-Congo, Volta-Congo, Benue-Congo, Kainji, Western-Kainji, Kambari Group, (Crozier and Blench 1992). Stark (2010, 2011) examined three Kambari dialects – Agwara, Auna, and Salka – and developed a working orthography. Salka speakers use Tsishingini, Auna speakers use Tsikimba while Agwara speakers use Cishingini. Kambari language is partially standardized, with Salka Kambari used in writing, and displays an SVO sentence structure with distinctions in number and person but not gender (Stark, 2010). This paper assumes that syntactic categories constrain argument structures, defined as the relations between heads and their lexical arguments (Hale & Kayser, 1999).

2. Literature Review

In numerous works over the past decades, beginning with the pioneering works of Gruber (1965) within the generative enterprise, Fillmore (1968), and Jackendoff (1972), it has been argued that each Argument of a predicate bears a particular thematic role, and that the set of thematic functions which Arguments can fulfil are drawn from a highly restricted, finite, universal set.

Thus, these earliest work on Theta Theory within the generative model was completed by Gruber (1965) and Fillmore (1968). Contrary to work done today, these renown scholars saw theta assignment as a reflection of the deeper ‘relations’ holding between arguments and their respective predicates. This tradition has continued in theories of Case Linking as well as in the Lexical Functional Grammar (henceforth LFG) and Head-Driven Phrase Structure Grammar (henceforth HPSG) syntactic models.

Gruber (1965) was impressed by the fact that there is consistent pattern in sentences that is best explained by their semantic similarities. To account for this, he proposed a “pre-Lexical” structure, which has properties “that are basic both to the syntactic form and the semantic relationships” (Gruber 1965: 2). Essentially, he proposed that at this level ‘syntax and semantics will have the same representation’ (ibid: 2). In his view, the pre-lexical structures for verbs contained information about the semantic relations that they held within the sentence. The fundamental semantic relation noted by Gruber is the “theme” (hence the further coinage of ‘thematic relations’), which he posits as necessary to all sentences.

He however, suggested several fundamental attributes of thematic roles that can be summarized thus: thematic roles are not syntactic – they represent some kind of basic information related to the semantic interpretation of the word; the most basic of the thematic roles is the “theme”; the “theme” is often found in two positions: either the subject position of non-causative verbs or the object position of causative verbs; the pre-lexical structure “projects” a structure.

An additional attribute of Gruber’s model needs to be demonstrated. Besides the fact that some thematic relations are always present in a sentence, Gruber observed that some arguments can take more than one thematic role. Invariably, some thematic roles seem to be shared over more than one argument. This is exemplified by the following sentence:

(1) David gave Mary a thousand pounds.

We can argue that “David” is both the Agent and the Source. Consequently, this led Gruber to the conclusion that some subjects are related to an incorporated formative in the pre-lexical structure.

Fillmore (1968) developed an approach referred to as Case Grammar within the generative parlance. Despite the fact that Fillmore called the relations he was describing as Case Relations, they were, to a large extent, what we would now call thematic relations. First, he observed that a sentence is made up of a “verb and one or more noun phrases, each associated with the verb in a particular case relationship” (Fillmore 1968: 21). Moreover, although a case may be shared among conjoined nouns in an NP, each case relationship can occur only once in a sentence. In the system developed by Fillmore, Cases (i.e. thematic roles) describe both the type of noun that can fill a case position and the role the noun plays in the sentence.

Jackendoff (1972) saw the efficacy in Gruber’s pre-lexical structures in their capacity to predict what kinds of thematic roles would be “required” by the semantics of a verb for a well-formed sentence. Building on this, Jackendoff proposes that the thematic relations should be derived by the semantic component, nominating the verb itself as the source: Clearly the verb of the sentence is what determines the [thematic] relationship: the lexical entry of a verb must correlate grammatical and thematic relations (Jackendoff 1972: 37).

All the three models of analyses Gruber, Fillmore and Jackendoff attempted to explain thematic roles in terms of a structural relation between the verb and its arguments. Gruber and Jackendoff worked on a pre-lexical or semantic structure, which explained the relations in further sentence derivations. Fillmore created structures directly within the syntax, deleting semantic information at a later stage of the derivation. However, the three proposals introduce a problem that still engages the minds of scholars today struggling to provide optimal solutions. Namely, if a thematic role is a relation between a verb and an argument, intuitively we feel that the argument is an NP. Nonetheless, this is not what the syntax would perhaps; lead us to believe if we were to analyze the structure only.

In effect, all the three approaches expound this by suggesting that “to” is somehow part of the thematic role itself. Either it is included in the pre-lexical structure, onto which the verb is mapped, or it is included in the verb’s lexical entry in the semantic sub-entry, or it is part of the case frame and may or may not appear in the surface structure.

More recently, research in this area has been extremely productive, and many new insights have been gained. Syntacticians have adopted an idealization of thematic relations which uses the notion theta roles. In most of the literature, the terms thematic relations and theta roles are used interchangeably. A theta role may thus be composed of one or more thematic relations, but crucially all of the thematic relations making up a single theta role must be assigned by a single element to a single position (Cowper, 1992). Two perspectives worth mentioning are the Projectionist view and the Constructionist approach to theta theory.

According to the Projectionist view, theta roles are projected from the verb to its arguments in a hierarchical manner. Moreover, the theta roles assigned by the verb project onto the syntactic structure of the sentence. The Projectionist view introduces the concept of "Projection Layers" to capture this hierarchical projection of theta roles. Each projection layer corresponds to a specific theta role assigned by the verb. The layers are ordered hierarchically based on the thematic hierarchy.

The Projectionist view of Theta Theory provides a way to capture the complex assignment of theta roles in a sentence and how they relate to the syntactic structure. It offers an analysis that incorporates the hierarchical nature of thematic roles and their projection within the syntax.

On the other hand, the constructionist account of Theta Theory is a theoretical perspective within the framework of generative linguistics that emphasizes the role of syntax and argument structure construction in the assignment of thematic roles (or theta roles) to constituents in a sentence. The constructionist account challenges the traditional view of Theta Theory, which posits that theta roles are assigned based on the intrinsic properties of individual lexical items (verbs and their arguments). Instead, the constructionist account argues that theta roles emerge through the interaction of syntactic constructions and the semantics of lexical items (Gibert-Sotelo and Marín 2024).

According to the constructionist account, the syntactic structure of a sentence is not simply a linear combination of individual words, but it consists of higher-level constructions that have their own internal organization and semantics. These constructions provide the framework for mapping arguments onto theta roles.

In this view, theta roles are not assigned by individual lexical items in isolation but are derived through the constructional properties of the larger syntactic structure. The specific combination of lexical items, phrase structures, and syntactic operations determines how theta roles are assigned and distributed within a sentence.

The constructionist account of Theta Theory emphasizes the importance of syntax and syntactic structures in determining the distribution and assignment of theta roles. It highlights the interaction between syntax and semantics and provides a more dynamic and construction-based perspective on how thematic roles are assigned in language.

One central task for any theory of grammar is to solve the so-called "linking problem": the problem of discovering regularities in how the participants of an event are expressed in surface grammatical forms and explaining those regularities. When there is a distinction between the language faculty and other cognitive faculties, then there must in principle be at least three stages in the association that need to be understood. First, there is the non-linguistic stage of conceptualizing a particular event. · For instance, while all of the participants in an event may be affected by the event in some way or another, human cognizers typically focus on one or the other of those changes as being particularly salient or relevant to their interests. This participant is taken to be the "theme" or "patient" of the event, perhaps in some kind of non-linguistic conceptual representation, such as the one developed by Jackendoff (1983, 1990). Second, this conceptual/thematic representation is associated with a linguistic representation in which the entity seen as the patient of the event is represented as (say) an NP that is the direct object of the verb that expresses what kind of an event it was. This is the interface between language and the conceptual system. Finally, there is the possibility of adjusting this representation internally to the language system, by way of movements, chain formations, Case assignment processes, or whatever other purely syntactic processes there may be. For instance, the NP that represents the theme and starts out as the direct object of the verb may become the subject if there is no other subject in the linguistic representation, either because there was no agent in the conceptual representation (as with an unaccusative verb), or because it was suppressed (as with a passive verb).

The linking problem arises because there isn't always a one-to-one mapping between the syntactic structure and the semantic roles in a sentence. Sometimes, a single syntactic argument can correspond to multiple semantic roles, or multiple syntactic arguments can correspond to a single semantic role.

Resolving the linking problem involves analyzing the various factors that influence the mapping between syntactic structure and semantic roles, such as verb subcategorization, case marking, word order, and context. Different theories and frameworks within linguistics propose different solutions to the linking problem, and ongoing research explores the intricacies of this relationship.

However, on theoretical grounds, it is assumed that principles of UG correlate thematic structure with syntactic structure in a uniform fashion. This assumption is embodied in the Uniformity of Theta-Assignment Hypothesis (UTAH, henceforth): ‘‘Identical thematic relationships between items are presented by identical structural relationships between those items at the level of D-structure’’ (Baker 1988, 46).

The fundamental principle of Theta Theory is the Theta-Criterion, a biuniqueness condition on theta-role assignment, which forces the requirements of the lexicon to be projected into syntax. Theta-role assignment is determined by syntactic configuration. By Uniformity, if the theta-role assignment is the same, the syntactic configuration must be the same at some level of representation. Thus, the standard formulation of the Theta-Criterion relates roles to arguments (Chomsky 1981: 36), and requires that every argument is assigned just one theta role and that every theta role is assigned to just one argument. Its main role is to determine the position to which NP-Movement is possible. The theta criterion imposes one-to-one relation between arguments and theta roles such that one NP can only be associated with one theta role and conversely one theta role is only assigned to one argument; given in (2) below:

(2). Theta Criterion: (Chomsky 1981:36)

a. Each argument is assigned one theta role;

b.      Each theta role is assigned to one argument

The Theta-Criterion is a principle in the theory of syntax, particularly in Generative Grammar, which ensures that each argument in a sentence is appropriately assigned a thematic role by the verb or other predicate in the sentence. The Theta-Criterion states that every participant in the event described by the verb must have a clear and unique theta role and every role that the verb specifies must be filled by exactly one participant. It is crucial for syntactic well-formedness and ensuring that sentences are semantically interpretable. Thus, it ensures that every argument in a sentence has a distinct and appropriate role, which contributes to the overall meaning and grammaticality of the sentence. Roles such as Agent, Patient, Theme, Beneficiary, Source, Goal, etc. are some of the theta roles assigned to arguments within the theta theory. It is assumed that these are assigned to the complements of lexical items as lexical property. This is because lexical heads carry Thematic Information: they are associated with a number of arguments, to which they assign a thematic role or theta role, agent, patient etc.

In Government-Binding theory, an argument is an expression with a theta role, and the position to which a theta role can be assigned is called an A(rgument)-position (Crystal 2008). Thus, theta-roles are assigned to arguments – where arguments are nominal positions. There are two types of arguments, ‘internal and external’. Although there is a convergence of opinion in the literature that verbs assign theta-roles to their internal arguments (= their subjects), opinions diverge as regards the assignment of theta-roles to external arguments (= subjects of predicates). Whereas Fillmore (1968) believes that the external arguments are also assigned theta-roles by the verb, Sells (1985: 36), Chomsky (1986: 59-60), and Radford (1988: 386-7) argue that it is not the verb but rather the entire VP that assigns a theta-role to its external argument. Thus, the semantic role of the external argument “is determined compositionally, depending on the meaning of the unit – V-NP” (Chomsky 1986:386).

The arguments of a verb are said to be selected by the verb. A verb that selects a particular type of argument is said to be subcategorized for that type of argument. The set of arguments selected by the verb, including the subject argument, constitutes its argument structure. Nouns, adjectives and prepositions also have argument structure.

It is important to equally note that, most researchers working within GB have assumed that theta-roles are assigned by verbs according to a universal hierarchy, which determines the order of realization of the arguments, thus giving rise to different types of argument structure. Among others, Carrier-Duncan (1985) proposes that certain arguments are higher than others in a hierarchy, which in turn determines their realization in a sentence in the manner of Larson (1988) and Grimshaw (1990). For instance, Grimshaw (1990) orders the realization of the different possible arguments according to the following thematic hierarchies: agent > experiencer > goal/source/location > theme.

Levin’s (1993) work is guided by the assumption that the behaviour of a verb, particularly with respect to the expression and interpretation of its arguments, is to a large extent determined by its meaning. Thus, verb behaviour can be used effectively to probe for linguistically relevant pertinent aspects of verb meaning. He attempts delimiting and systematizing the facets of verb behaviour. The contents of Levin’s study should help pave the way toward the development of a theory of lexical knowledge. Ideally, such a theory must provide linguistically motivated lexical entries for verbs which incorporate a representation of verb meaning and which allow the meanings of verbs to be properly associated with the syntactic expressions of their arguments. The present paper is, however, guided by this assumption.

Levin (1993) further posits that a representative of a wide range of phenomena that suggest that a speaker's knowledge of the properties of a verb goes well beyond an awareness of the simple expression of its arguments – the type of lexical knowledge traditionally represented in subcategorization frames. Furthermore, the speaker's ability to make subtle judgments about possible and actual verbs and their properties makes it unlikely that all that a speaker knows about a verb is indicated in its lexical entry. Thus, Pylkkanen (2002) states that verbs describe events in the world and verbal arguments name individuals that stand in some relevant relations to those events.

2.1 Theoretical Framework

Theta theory is a linguistic framework within the field of generative grammar that seeks to explain the structural relationship between verbs and their arguments in sentence formation. It was initially proposed by Chomsky (1981, 1986) as a sub-theory of the Government and Binding (GB) theory and has since undergone various developments and modifications. The main goal of theta theory is to account for the assignment of thematic roles to noun phrases (NPs) (arguments) in a sentence and to establish the syntactic representation of these roles. Thematic roles refer to the different semantic relationships that nouns have with the verb in a sentence, such as agent, patient, theme, experiencer, instrument, benefactor, goal, etc.

The central claim of Theta Theory is that argument structure does not consist of just a set of arguments but is rather a structured representation over which relations of prominence are defined. One kind of evidence comes from theta-marking in predicates. The behaviour of the predicate in human language provides another kind of evidence for positing a structured argument structure: their behaviour can be understood as resulting from a mismatch between their thematic prominence relations.

The verb is the central element in the prelexical structure earlier proposed in pre-GB days, other elements are given labels (roles) associated with particular verbs (Gruber 1976: 2). Thus, Aitchison (2003: 125) posits that verbs dominate a sentence and dictates its structure, while Baker (2003: 95) argues that syntacticians are accustomed to specify the Theta-grid (a list of the verb’s argument structure to show how many arguments the verb takes, what kind of arguments they are (agent, theme, experiencer, goal, instrument, etc.), and in what order they appear in the verb's lexical entry) of a lexical item and to having this grid determine the syntactic structure that the word appears in, which forms their relation. The relationship between verbs and their arguments is a widely debated topic in linguistics. A verb's semantics can determine the morphosyntactic realization of its arguments. Assuming a close connection between verb meaning and syntactic structure, it provides a bridge between lexical-semantic and syntactic research, synthesizing the results of work from a range of linguistic sub-disciplines and in a variety of theoretical frameworks.

Argument structure is the set of participants a verb requires and how those participants appear in sentences. It is the part of a verb’s meaning that determines how many arguments the verb needs, what kind of arguments they are, and how they are syntactically arranged. This paper is therefore guided by the assumption that the behaviour of a verb, particularly with respect to the expression and interpretation of its arguments, is to a large extent determined by its meaning. Thus, verb behaviour can be used effectively to probe for linguistically relevant pertinent aspects of verb meaning. This paper therefore, offers an attempt at delimiting and systematizing the facets of verb behaviour that can incorporate a representation of verb meaning and to allow the meanings of verbs to be properly associated with the syntactic expressions of arguments.

The arguments of a predicate cross-linguistically are realized syntactically as the subject, direct object, and indirect object and semantically as the agent, patient, experiencer, theme, and so on. The relationships entered into by different predicates with their arguments are varied. The arguments are classified into semantic categories according to the kind of role they play in the sentence in combination with their predicates.

However, human languages do not define straightforward mappings between thoughts and words. To get a sentence, it is not enough to select the appropriate words and string them together in an order that conveys the meaning relationships among them. Though verbs are choosy, not all verbs can appear in all sentences, even when the combinations make perfect sense. Different subcategories of verbs make different demands on which their arguments must be expressed, which can be optionally expressed, and how the expressed arguments are encoded grammatically – that is, as subjects or objects. Arguments of a given predicate in Kambari are associated with positions in a syntactic structure and the role they play in the language which hitherto identifies and further describes the most basic thematic relations encoded in various theta roles in the language (Dantata (2024). The properties of verbs in different subcategories are specified by their entries in the mental lexicon – argument structures the set of participants a verb requires and how those participants appear in sentences.

3. Methodology

The methodology for this paper is both empirical and theoretical in nature. Hence, fieldwork method was implored in collecting the relevant data and the theoretical tool of Theta Theory was used in the analysis. This method was particularly exploited in eliciting the data on Kambari and then proceeds with its examination and representation, first using introspection to determine grammaticality judgment before finally submitting the data to analytical framework of Theta-Theory using Principles and Parameters Approach.

4. Key Concepts in Theta Theory

Some of the key concepts of grammatical analyses in theta theory include the following:

Thematic Roles: Thematic roles are assigned to arguments in a sentence based on their semantic relationship with the verb. Examples of thematic roles include agent, patient, theme, experiencer, etc.

Theta Grid: The theta grid is a representation of the thematic structure of a sentence and it determines the grammatical relationships and constraints between arguments. It consists of a list of theta roles associated with each argument in a sentence. Each theta role can only be assigned to a single argument, and each argument must be assigned a unique theta role.

Theta Criterion: The Theta Criterion is a principle in theta theory that states that every argument in a sentence must be assigned a theta role by the verb. It ensures that all the arguments in a sentence have a thematic role and that no argument is left unassigned or has multiple theta roles.Though there are cases for arguments bearing multiple theta roles in Kambari in collaboration by the empirical evidence provided by Jackendoff (1972).

Thematic Hierarchy: The thematic hierarchy is a ranking of thematic roles based on their syntactic behaviour and prominence. Certain roles have a higher ranking and tend to be assigned to arguments in the specifier positions of functional projections, while lower-ranking roles are assigned to arguments in the complement positions.

Theta-Role Assignment: Theta-role assignment involves the process of assigning theta roles to arguments in a sentence. The assignment is determined by various factors, including the lexical properties of the verb, the structural position of the argument, and the thematic hierarchy.

5. Data Presentation and Analysis

This section provides presentation and analysis of the data obtained in Kambari. For instance, giving the sentence in (3), the argument “Magaji” (the beneficiary) is structurally separated from the verb by being embedded in a PP, thus:

(3) Shagiya[AGENT] cá ta mr[THEME a tyó yaMagaji[BENEFACTIVE]

Shagiya.NOM give.pst CM wine.OBJ at go.prct. to Magaji.OBJ

‘Shagiya gave the wine to Magaji.’ [__NP, PP]

  Agent>Theme>Benefactive

The structure in (3) shows that the verb “cagive” subcategorize for three arguments in Kambari – Shagiya, mara, and Magaji. Each of these arguments is assigned a theta role of Agent, Theme, and Benefactive respectively. This data further show that in Kambari, the Nominative position can further be assigned Source role apart from being an Agent. The Theta-Criterion states that every participant in the event described by the verb must have a clear and unique theta role and every role that the verb specifies must be filled by exactly one participant, this becomes too strong for the language, because Agent and Source can be assigned to an argument at the same time. In effect, Projectionist view suggested that “to-ca” is somehow part of the thematic role itself as seen by the Kambari data above.

In a sentence like (4) below, the verb "gave" assigns the theta roles Agent/Source, Benefactive, and Theme to the NPs “Shagiya”, “mr, and “Magaji” respectively. According to the Projectionist view, these theta roles project onto different projection layers, representing their hierarchical relationship.

(4) Shagiya[AGENT] ca ta Magaji[BENEFACTIVE] mara[THEME]

Shagiya.NOM give.pst CM Magaji.OBJ wine.OBJ

‘Shagiya gave Magaji the wine’. [__NP, NP]

  Agent>Benefactive>Theme

The example above shows how movement of arguments occur and how it affects the hierarchical structure of theta roles assigned to arguments due to alternation of the arguments. In example (3), we have Agent>Theme>Benefactive, while in example (4) we have Agent>Benefactive>Theme. This clearly shows that alternation can make arguments to move from their original position to occupy certain positions by the grammar of the language.

Consider the sentence in (5) below: In a constructionist account, the theta role of the agent (Jatau) and the patient (yàndà’a) is not determined solely by the individual meanings of “Jatau” and “ɓósó” but by the construction that relates an agent and a patient in a transitive event. The construction provides the frame within which the theta roles are assigned.

(5) Jatau[AGENT] ɓósó  ta yàndà’a[PATIENT]

Jatau.NOM break.pst CM calabash-the.OBJ

‘Jatau broke the calabash’ [__NP]

  Agent>Theme

This shows that the verb subscribe for two arguments due to its transitive nature. The semantic interpretation of the verb subcategorizes for an Agent that must perform the action and a Patient who eventually received the action of the verb.

Consider example (4) taken here as (6) below. Syntactically, "Shagiya" is the subject, "Magaji" is the direct object, and "mara’a" is the indirect object. Semantically, however, "Shagiya" corresponds to the agent role, "Magaji" to the benefactive role, and "mara’a" to the theme role.

(6) Shagiya[AGENT] ca ta Magaji[BENEFACTIVE] mara[THEME]

Shagiya.NOM give.PST CM Magaji.OBJ wine.OBJ

‘Shagiya gave Magaji the wine’. [__NP, NP]

  Agent>Benefactive>Theme

It will thus be ungrammatical for a construction which its verb subcategorizes for three arguments to have only two. This shows that the subcategorization frame will lack one of the mandatory arguments. For instance, when cagive requires three arguments and a speaker end up providing just two arguments, the construction becomes illicit, ill-formed, and ungrammatical as example (7) buttresses:

(7) * Shagiya[AGENT] ca ta Magaji[BENEFACTIVE]

Shagiya.NOM give.PST CM Magaji.OBJ

*‘Shagiya gave Magaji the wine’. [__NP]

  Agent>Benefactive

In the above example, the Theme role is missing which makes the construction ungrammatical. Verbs of this nature require three arguments which must be fulfilled before the sentence becomes grammatical in Kambari.

The Theta-Criterion states that every participant in the event described by the verb must have a clear and unique role and every role that the verb specifies must be filled by exactly one participant as can be seen in Kambari data below:

(8) Cìmbì’i[AGENT] tánù  taìkàrábù[THEME] o mòlólì’i[GOAL]

Farmer-the load.Pst CM maize  on donkey-the

The farmer loaded the maize on the donkey.

Tanu verb [___NP, PP]

Tanu: verb; 1 2 3

 NP NP PP <Agent, Theme, Goal>

1

NP

2

NP

3

PP

i

j

k

Each of the arguments Chimbi’i, ìkàrábù and mòlólì’i has one unique role of Agent, Theme and Goal respectively fulfilling the Theta-Criterion using the Theta Grid. However, violation of Theta-Criterion can be seen where the verb requires certain number of arguments and role is not assigned to one of such arguments as the Kambari data below shows:

(9) *Cìmbì’i[AGENT] tánù  ta ìkàrábù[THEME]

*Farmer-the load.Pst CM maize 

*The farmer loaded the maize.

Tanu verb [___NP]

Tanu: verb; 1 2

 NP NP Agent>Theme

1

NP

2

NP

 

i

j

k

This clearly shows a violation of Theta-Criterion which makes the construction ill-formed because the verb tánù requires three arguments but only two suffice with the roles of Agent and Theme; the Goal position in the Grid is left empty which makes the construction ill-formed, just like the one in example (7) above.

Thus, in the entry for PUT in a sentence such as example (10) below:

(10) Ayashe[AGENT] zùwà ta ìlyályá’a[THEME] a aàvàlú’u[LOCATION]

Ayashe .NOM put CM food-the.OBJ on ground the.OBJ

Ayashe put the food on the mat. [__NP, PP]

  Agent>Theme>Location

The NP complement “ìlyályá’a” is assigned the role of Patient (or Theme) and the PP complement “aàvàlú’u” is assigned the role of Location. It is further assumed that the majority of verbs theta marks the subject position of sentences containing them. In this regard, the subject NP of (10) above (i.e Ayashe) is assigned the Agent role. Any constituent assigned a theta role, by definition denotes a predicate argument.

The Subcategorization frame and Theta Grid for the verb ‘ca– give’ in example (3) can be seen in (11) below:

(11) ca: verb; [__NP, PP]

ca: verb; 1 2 3

 NP NP PP <Agent, Theme, Benefactive>

1

NP

2

NP

3

PP

i

j

k

ca: verb;

 

 

 

The subcategorization frame of ‘ca– give’ requires three arguments – NP1, NP2, and PP(NP)3. The last argument can either be PP, enclosed within a prepositional phrase or another NP. The Theta Grid maintains that for the arguments contained in the frame, they must be assigned roles of Agent, Theme, and Benefactive respectively.

6. Conclusion

The paper has, thus far, discussed that the thematic structure associated with lexical items must be saturated in the syntax, as stated in the theta criterion. Even though part of our data suggests that the principle is too strong. One of the central issues concerning the lexicon-syntax interface is how these roles are distributed across syntactic arguments. The classical Theta Criterion (Chomsky 1981) is probably not necessary to regard it as an independent principle of grammar. The observation that argument structure need to receive at least one theta-role reduces to the independently necessary principle of full interpretation: an argument without such a role could not be interpreted. It is not clear whether the other generalizations expressed by the Theta-Criterion are actually valid; at the least they are analysis-dependent. These other generalizations are that every theta role must be assigned to some argument, and that an argument cannot receive more than one such role is too strict in Kambari because there are cases of arguments bearing multiple theta roles. This is collaborated by the empirical evidence provided by Jackendoff (1972).

It is noteworthy that arguments of predicates in Kambari are identified in terms of distinct thematic roles, thereby giving theta roles their status in the grammar of the language. Theta role status in the grammar enables us to state generalizations in both language-specific and crosslinguistic terms regarding the taxonomy of arguments, and also to distinguish between the thematic structure of predicates which have the same number of arguments but differ in the kind of arguments they have. Furthermore, the universal theta role hierarchy is the basis on which the linking rules are expressed in Kambari and grammatical relations are equally defined and realised. Theta theory has been influential in understanding the relationship between syntax and semantics and has provided insights into the grammatical structure of sentences in Kambari and it helped to identify some of the core principles of Universal Grammar.

The paper concludes, as part of its findings that Kambari data has an exception with respect to Theta Criterion because some arguments can be assigned two theta roles. Each theta role must be assigned to an argument in Kambari. The verb in Kambari determines the number of arguments it subcategorises for in a sentence. Any unfilled subcategorization frame in the sentence of Kambari will render such construction ungrammatical in the language. Theta Theory provides the bridge between meaning and syntactic structure, shaping grammaticality, predicting syntactic transformations, cross-linguistic universals, and the lexicon-syntax interface in human languages.

 

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