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Complementizer

In linguistics, a complementizer is a functional head (often labeled C) that projects a Complementizer Phrase (CP), the uppermost syntactic category in clause structure, which embeds a Tense Phrase (TP) and specifies the clause's illocutionary force or mood, such as declarative, interrogative, or imperative. Complementizers typically introduce subordinate clauses, particularly finite complement clauses that function as arguments of predicates like verbs of cognition, speech, or perception, thereby linking the embedded proposition to the matrix clause. In English, prototypical complementizers include that (for declarative content clauses, as in "She believes that the earth is round"), if and whether (for yes/no questions, as in "I wonder whether it will rain"), and infinitival to in non-finite constructions; these elements are often optional, especially that in informal speech. Across languages, complementizer systems exhibit significant variation: while English relies on overt lexical items, many languages mark subordination through verbal morphology, intonation, or null complementizers rather than dedicated words, and some employ multiple complementizers to encode nuances like evidentiality or polarity. In generative syntactic theory, the CP layer is universal, with the complementizer position potentially filled, empty, or realized as part of the verb, influencing phenomena like subject-auxiliary inversion in questions and embedding constraints.

Definition and Syntactic Role

Core Definition

In , a complementizer is a functional category, labeled as , that introduces subordinate clauses serving as complements to predicates such as verbs, nouns, or adjectives. These elements mark the embedded clause's syntactic status, enabling it to function as an within the larger . The primary function of complementizers lies in clausal embedding, where they signal the relationship between a clause and its subordinate complement. In English, for instance, "that" acts as a complementizer in sentences like "I know that she left," identifying the following finite declarative as the direct object of the verb "know." This role allows for the integration of complex propositional content as an , distinguishing embedded clauses from independent ones. The Complementizer Phrase (CP) represents the syntactic projection headed by C, providing the structural frame for such embeddings. Complementizers differ from coordinating conjunctions (e.g., "and," "or") and subordinating conjunctions that introduce adverbial clauses (e.g., "because," "although"), as they specifically head finite or non-finite clausal arguments rather than linking coordinate structures or modifying the main clause adverbially. For example, "because" in "She left because it rained" introduces a reason adverbial, not a complement. The term "complementizer" was coined by Peter S. Rosenbaum in 1967 to describe markers unique to predicate complement constructions in English syntax. It gained prominence in through Noam Chomsky's development of in the , formalizing complementizers as heads of within the principles-and-parameters framework.

Position in Complementizer Phrase (CP)

In generative syntax, the complementizer (C) functions as the head of the Complementizer Phrase (), the highest functional projection in the clausal structure, as formalized within the of phrase structure. This theory posits that every phrasal category projects hierarchically from a lexical head, with the CP comprising the head C, the intermediate bar-level projection C' (which combines the head with its complement), and the maximal projection (which may include a specifier). The introduction of CP as a distinct functional category allowed for a unified of clause-peripheral elements, distinguishing them from the lower Tense Phrase (TP, formerly IP) that encodes verbal agreement and tense features. The occupies the left periphery of the , immediately dominating the TP and thus preceding the subject and predicate in linear order. In English, this positioning is evident in declarative clauses, where the complementizer that precedes the subject-verb , as in She believes [CP that [TP he left]]; here, that realizes the C head, situating the entire above the TP complement. This left-peripheral placement ensures that C governs -type distinctions, such as declarative versus , by interfacing with higher sentential projections or the matrix . Key interactions within the CP structure involve C selecting a TP as its sister complement, yielding the basic schema [{CP} Spec [{C'} C [_{TP} ... ]]], where the specifier (Spec-CP) remains available for movement operations. Specifically, Spec-CP targets wh-phrases via in questions or relative clauses, and it may host topicalized elements in languages permitting topic-fronting, thereby encoding discourse-related features at the clause edge. This hierarchical organization receives support from syntactic phenomena involving C-driven movement, such as subject-auxiliary inversion, where an interrogative feature in C attracts the auxiliary verb from T to the head position, as in the matrix question Did she leave? (with the subject following the inverted auxiliary). In embedded questions, the overt complementizer whether or if fills the C head, blocking auxiliary inversion while permitting wh-movement to Spec-CP, as in I asked [CP whether [TP she left]], demonstrating how C coordinates the positioning of interrogative elements relative to the TP complement.

Properties of Complementizers

Realized vs. Empty Complementizers

Complementizers can be realized overtly through lexical items that occupy the C head in the complementizer phrase (CP), providing explicit marking of clause type, mood, or tense features. In English, the complementizer "that" introduces finite declarative embedded clauses, as in the sentence "I believe that it is true," where "that" signals the subordinating force of the complement. Similarly, in French, the invariant complementizer "que" embeds both indicative and subjunctive clauses, with its selection influencing verbal morphology to encode mood distinctions, such as indicative in "Je sais que tu viens" (I know that you are coming) versus subjunctive in "Je veux que tu viennes" (I want you to come). These overt forms often carry morphological properties tied to the embedded clause's interpretive properties, ensuring clear syntactic and semantic boundaries. In opposition, empty or null complementizers occupy the C position without phonological realization, relying on contextual or syntactic licensing for their presence. In English, null C appears in infinitival constructions through omission of "for," as in "I would like [∅ him to attend]," where the embedded subject receives case from the null complementizer despite its absence. This omission is optional and governed by adjacency conditions at phonological form, preventing merger of the affix-like "for" when not adjacent to its . In languages like , embedded clauses frequently feature a phonologically null C, particularly in topic-prominent structures where the clause-initial topic licenses the empty element, as in constructions equivalent to "I think [∅ he left]," without an overt subordinator. Phonological for such null Cs includes prosodic boundaries and intonation patterns that distinguish embedded from matrix clauses, even in the absence of lexical material. Theoretical analyses within minimalist syntax attribute null Cs to economy principles, positing that overt realization is dispensed with when feature valuation—such as for tense, , or case—can occur without it, minimizing derivational . for their syntactic reality includes case assignment to embedded subjects (e.g., accusative in English ECM constructions with null C) and agreement phenomena, where the empty C mediates phi-feature checking between the matrix verb and the embedded clause. A notable involving empty Cs is complementizer deletion, observed across English varieties, where overt forms like "that" are omitted in informal or dialectal speech, yielding structures such as "I think [∅ she left]." This deletion is more prevalent in certain dialects, including , and is conditioned by factors like adjacency to the embedded subject and discourse context, without disrupting clause embedding. Such patterns highlight the optional nature of phonological realization for C, balanced against syntactic requirements for CP projection.

Selectional Restrictions on Complements

Complementizers impose selectional restrictions on the embedded they introduce, determining the syntactic and semantic properties of the complement. These restrictions ensure compatibility between the matrix and the embedded , often aligning with the 's illocutionary or tense properties. For instance, the English complementizer that selects for declarative , as in "I believe that it is raining," where the embedded expresses a . In contrast, if or whether selects for complements, typically yes/no questions, as in "I wonder if it is raining," restricting the to an unresolved query rather than an assertion. Selectional restrictions also distinguish between finite and non-finite tense phrases (TPs). Finite complementizers like English that or Modern Greek oti require a tensed TP, embedding a complete proposition with agreement and tense marking, as in "She knows that he left." Non-finite contexts, however, often involve complementizers such as English to or a null complementizer in infinitival clauses, selecting untensed TPs that function as open predicates, exemplified by "I want to leave," where the embedded verb lacks tense. This distinction arises because finite Cs project outside the clause to take propositional arguments, while non-finite ones integrate more closely with the verb phrase. Epistemic selection further refines these restrictions, particularly in marking factivity. Factive predicates, such as "know" or "regret," presuppose the truth of their complement and typically select declarative Cs like that, as in "She knows that it rained," implying the event's reality. Non-factive predicates, like "believe" or "doubt," do not carry this presupposition and may select interrogative Cs such as whether, as in "I doubt whether it rained," allowing for uncertainty about the proposition's truth. This epistemic alignment influences complement choice, with factive Cs reinforcing assertive force and non-factive ones permitting modal or doubtful interpretations. In polycomplementation structures, multiple complementizers can stack to indicate embedding depth or clause type, particularly in Balkan languages. For example, employs sequences like ca să (subjunctive) in nested clauses, where the outer ca selects a subjunctive and the inner marks the non-finite subjunctive, as in "Vreau ca să vină" (I want to come). Such stacking reflects layered selectional requirements, with each C imposing restrictions on the following clause's or finiteness, though it is prohibited within single clauses in languages like . This phenomenon highlights how complementizers encode hierarchical dependencies in complex embeddings.

Diachronic Sources and Evolution

Development from Determiners

In grammaticalization theory, determiners such as frequently evolve into complementizers through a process of semantic bleaching, where their original referential or deictic meaning diminishes, allowing them to function as clause linkers without retaining nominal specificity. This is particularly well-attested in , where shift from heading noun phrases to introducing subordinate , often via intermediate stages in correlative or relative constructions. The change aligns with broader principles of , including phonological reduction and loss of inflectional features, transforming a contentful determiner into a functional head in the complementizer phrase (CP). A prominent example is the English complementizer that, which derives from the Old English demonstrative pronoun þæt, originally used deictically to refer to entities or situations. In Old English texts, þæt appears in correlative constructions linking main clauses to explanatory subordinates, gradually reanalyzed as a fixed introducer of finite complements by Middle English, with concomitant reduction in stress and loss of case agreement. Similar developments occur across ; for instance, German dass stems from Old High German thaz, a neuter demonstrative that evolved through relativizing functions in explicative clauses to become a declarative complementizer, evidenced in early texts like the Tatian . Dutch dat and Swedish att follow analogous paths from demonstrative roots, illustrating a shared Germanic pattern where definite markers or pronouns adapt to subordinate clause embedding. The typically proceeds in distinct stages: initially, the serves as a full nominal head or pronominal anaphor in appositive or correlative structures, retaining deictic force; subsequently, bleaching erodes its referential content, repositioning it as a subordinator that selects clausal complements; finally, it fixes as an invariant complementizer in C position, often with phonological erosion and desubstantivization, such as the loss of and number marking. This sequence is supported by comparative reconstruction, tracing the shift to Proto-Indo-European like *tó- or *tod, which yielded complementizers in daughter languages—e.g., Latin quod (from *kʷod, a relative- form) and hóti—through inherited correlative patterns that facilitated clause subordination without dedicated C heads in the . Historical corpora from Gothic and further corroborate this trajectory, showing early use in clause-linking before full reanalysis.

Development from Interrogative Words

In many languages, complementizers introducing questions have grammaticalized from words or particles, undergoing semantic bleaching and phonological reduction to mark clause subordination while retaining traces of their question-forming function. This process typically involves a shift from elements that initiate direct inquiries to fixed heads in the complementizer position (C) of clauses, often via reanalysis where features are repurposed for . A prominent example occurs in the , where the complementizer "if" derives from "gif," an interrogative and conditional particle used in yes/no questions and conditionals. In , "gif" could introduce direct questions or conditional antecedents, as in "Gif hwa hit bletsad, þonne ablynsed" ("If anyone blesses it, then it ceases"), but over time, it reanalyzed into a subordinator for indirect questions, such as modern "I if he left," marking non-factual embedded yes/no . This entailed loss of prosodic independence and expansion to select interrogative complements under verbs like "" or "ask." Similar developments are evident across language families. In , the complementizer "si" (French, Italian, Spanish, etc.) originates from Latin "si," an particle for yes/no questions and conditionals, which evolved to introduce s signaling uncertainty, as in French "Je me demande si il est arrivé" ("I wonder if he arrived"). This shift involved reanalysis from a focus on direct inquiry to embedding hypothetical or unknown propositions, often with negative or non-factive predicates. In , the enclitic "li" in , , and Bulgarian grammaticalized from an particle marking direct yes/no questions, such as "Priyezzhayut li?" ("Are they coming?"), to a complementizer in indirect questions like "Ya ne znayu, rabotayet li on" ("I don't know if he works"). Here, "li" cliticizes to the first stressed element in the clause, facilitating subordination while preserving its polarity-question semantics. The primary mechanism driving this grammaticalization is reanalysis within indirect questions, where interrogative elements originally in specifier position (Spec-CP) via become fixed in the C head, altering their merge from internal (movement) to external (base-generation). This occurs as direct questions embed under matrix verbs, leading to semantic weakening of the force into a subordinating marker and phonological erosion, such as cliticization in Slavic "li." Such complementizers often reference selectional restrictions, embedding only under predicates that license moods, like or verbs. These developments are typically constrained to yes/no or alternative questions, excluding full wh-complements where the wh-word remains in Spec-CP (e.g., English "how" can embed as "I know how it works," but "if" does not introduce wh-clauses). This restriction arises because the original interrogative particles encoded rather than variable-binding, limiting their scope to non-exhaustive interrogatives upon reanalysis.

Development from Prepositions and Verbs

In some languages, locative prepositions have undergone to function as subordinators that introduce clauses, effectively serving as complementizers in subordinate constructions. For instance, in certain of the branch, locative prepositions historically derived from locative prefixes or markers have reanalyzed to mark clausal subordination, particularly for expressing or reason, where the preposition's spatial sense bleaches into a more abstract subordinating role. This path illustrates how adpositional elements can shift from denoting location to embedding finite clauses, often retaining traces of their original semantic content in restricted environments like purposive complements. A parallel but distinct grammaticalization trajectory involves verbs, particularly in serial verb constructions prevalent in West African languages, where verbs of saying evolve into quotative complementizers. In Ewe, a Kwa language, the verb 'say' has grammaticalized into a complementizer introducing reported speech or factive complements, originating from serial verb structures where the 'say' verb linked matrix and embedded clauses before losing its verbal inflection and argument-taking properties. This reanalysis is typical of Niger-Congo languages, where the verb's declarative function facilitates its bleaching into a pure subordinator, as evidenced in diachronic shifts documented across related Gbe varieties. In creole languages, hybrid paths combining prepositional and verbal sources are common, reflecting substrate influences and contact-induced innovation for marking non-finite complements. For example, in Atlantic creoles like those derived from Gbe substrates, prepositions such as equivalents of 'for' (from locative or purposive origins) combine with reduced verbal forms like 'say' to form complementizers that introduce infinitival or non-finite clauses, as seen in the bifurcated evolution of for serving both prepositional and complementizing roles without full merger into a single category. This hybridity arises through reanalysis in contact settings, where substrate serial verbs and superstrate prepositions analogize to create multifunctional subordinators, often selecting for non-finite complements as briefly noted in discussions of selectional restrictions. These diverse paths from prepositions and verbs challenge assumptions of universal sources for complementizers, highlighting language-specific innovations driven by , , and semantic extension rather than a single parametric trigger. Theoretical models must account for such variability, as the grammaticalization from adpositions or serial verbs into C-heads implies flexible categorial shifts that question strict hierarchies in functional projections, emphasizing the role of constructional reanalysis in category creation across non-Indo-European families.

Cross-Linguistic Manifestations

In Semitic Languages

In Semitic languages, complementizer systems exhibit notable morphological complexity, particularly in Neo-Aramaic dialects like Assyrian Neo-Aramaic and in Hebrew, where they often interface with the language's non-concatenative root-and-pattern morphology. Assyrian Neo-Aramaic, a Northeastern Neo-Aramaic variety spoken by Christian communities in northern Iraq and surrounding regions, employs multiple complementizers that mark subordinate clauses with functional specificity. The primary complementizer d- serves as a general marker for relative and declarative clauses, introducing complements after verbs of perception, cognition, or speech, as in šmēʾle d-ile bróne b-ε-mðìta ('he heard that his son was in that town'). A specialized form, metel d-, functions causally and derives from a manner adverb meaning 'how' or 'because', appearing in constructions expressing reason, such as those following verbs indicating cause or explanation. While d- itself remains invariant without gender or number agreement, the verbs it governs often inflect for these features, reflecting subject properties in line with the language's agreement patterns. Hebrew complementizers demonstrate similar functional differentiation but with a clearer division between declarative and non-declarative uses. The prefix še- predominantly introduces declarative complements and is the default for factive verbs like yada ('know'), occurring in 88% of such cases in modern corpora, as in yada še-hu ba-bayit ('he knew that he is at home'). In contrast, ki marks factives, conditionals, and more formal or archaic declaratives, preferred with verbs like amar ('say') at 55% usage, such as amar ki hu ba ('he said that he is coming'). Historically, Biblical Hebrew favored ki for a broader range of complements, including in narrative contexts like Genesis 3:11 (ki COMP taxzeru, 'because you have eaten'), but Modern Hebrew has shifted toward še- as the general-purpose form, with ki retaining a stylistic role for archaism or emphasis in literary texts. This evolution reflects standardization efforts in the revival of Hebrew, where še- became interchangeable with ki in many non-factive contexts but not with relativizers like ʾašer. Shared traits across these systems include integration with verbal , where complementizers like d- or ki combine with tense and mood markers on embedded verbs, such as subjunctives for (d-<āθe, 'so that he may come') or indicatives for facts. In embedded speech, stacking of complementizers occurs in reported constructions, allowing layered subordination as in Hebrew amar še-ki hu ba ('he said that he is coming'), though this is rarer and context-dependent. Recent post-2010 studies highlight dialectal variation in Neo-Aramaic complementizers due to , particularly with and ; for instance, Urmi varieties show semantic shifts in d- usage under Iranian influence, with perception verbs favoring distinct complementizers for direct versus indirect complements, contrasting with more uniform patterns in isolated dialects. These changes underscore contact-induced innovations in complementizer distribution without altering core .

In Sign Languages

In sign languages, complementizers are typically realized through a combination of optional manual signs, non-manual markers, and spatial indexing rather than dedicated lexical items, reflecting the visual-gestural modality's emphasis on and iconicity. In (ASL), epistemic complement clauses often employ verbs like THINK or KNOW followed by an embedded , where the complementizer position is frequently null or indicated by non-manual signals such as raised eyebrows or head tilts to mark subordination and clause boundaries. For instance, a construction expressing "I think he left" might gloss as THINK [raised eyebrows: HE LEAVE], with the non-manual marker scoping over the embedded to signal its finite status without an overt "that" sign, which is rare and considered influenced by English contact. Empty complementizers are common in such embeddings, aligning with broader patterns in sign languages where prosodic cues like eye blinks or headshakes further delineate structure. A distinctive feature of sign languages is the use of signing space for complementizer indexing via loci—designated spatial locations assigned to referents—to facilitate embedding and , diverging from the linear ordering typical in spoken languages. In ASL, for example, infinitival complement clauses under control verbs establish loci for arguments (e.g., a man at locus-i and a at locus-j), as in the gloss IX-1 FORCE-i MAN i-GIVE-j j-POSS BOOK, where spatial pointing maintains referential links across the matrix and embedded without sequential alignment. This spatial allows for non-linear clause integration, such as center-embedding, where the embedded is articulated in a designated spatial plane to indicate subordination. Similar patterns appear in other sign languages, including (BSL), where null complementizers predominate in declarative embeddings under predicates like KNOW, glossed as PRO1-KNOW [ø CLAUSE], often accompanied by non-manual markers for or to clarify boundaries. Loci play an analogous role in BSL for argument indexing in complements, enabling spatial separation of matrix and embedded elements. Emerging research from the 2020s on and village sign languages, such as and Al-Sayyid Bedouin Sign Language, reveals hybrid complement systems arising from community contact, where manual signs from dominant sign languages blend with innovative non-manual and spatial strategies for subordination, often featuring optional overt markers in early generations that stabilize into null forms over time.

In Other Language Families

In Niger-Congo languages such as Yoruba, complementizers often derive from serial verbs, including forms like "say" used as quotatives to introduce reported speech or thought complements, with marking distinctions in clause types such as declarative versus subjunctive. For instance, the complementizer pẹ́ introduces factive complements under verbs of , while marks irrealis or purposive s, functioning without verbal agreement and selecting non-finite structures. These elements highlight a serial verb pathway common in the , where full verbs evolve into subordinators without losing semantic traces of or causation. In Austronesian languages like , complementizers are sensitive to the voice and mood systems, with serving as a declarative linker that connects matrix verbs to embedded clauses without distinguishing finite from non-finite categories, instead aligning with actor or undergoer focus. This polyfunctional particle, often cliticized as -ng, embeds clauses under predicates of perception or causation, emphasizing syntactic ergativity where the complement's pivot determines morphological marking rather than tense-based subordination. Such systems underscore the family's reliance on aspectual and focus-driven complementation, diverging from Indo-European tense-oriented models. Language isolates like exhibit polyfunctional complementizer particles that select ergative clauses, with -ela introducing declarative complements under factive verbs and -enik marking negative or non-factive embeddings, often agreeing in features like with the matrix subject. These suffixes attach to the embedded verb, reflecting the language's head-final order and absolutive alignment, where complements function as nominalized arguments without separate relative pronouns. Recent documentation of endangered Amazonian languages, such as the Tariana from northwest Amazonia, reveals complementizers evolving from prepositions, with the subordinator -ka filling object slots in verb constructions and contrasting with nominalizers for nominal complements. In (also Arawak), 2020s fieldwork has identified preposition-derived particles like je- for purpose clauses, emphasizing the region's typological diversity in zero-marked versus overt subordination amid language endangerment pressures. These patterns, documented in ongoing revitalization efforts, illustrate how preposition supports complex embeddings in isolate-like Amazonian profiles.

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