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Grammatical features
Related to nouns Animacy Case Dative construction Dative shift Quirky subject Nominative Comitative Instrumental Classifier Measure word Construct state Countability Count noun Mass noun Collective noun Definiteness Gender Genitive construction Possession Suffixaufnahme (case stacking) Noun class Number Singular Dual Plural Singulative-Collective-Plurative Specificity Universal grinder
Related to verbs Associated motion Clusivity Conjugation Evidentiality Modality Person Telicity Mirativity Tense–aspect–mood Grammatical aspect Lexical aspect (Aktionsart) Mood Tense Voice
General features Affect Boundedness Comparison (degree) Egophoricity Pluractionality (verbal number) Honorifics (politeness) Polarity Reciprocity Reflexive pronoun Reflexive verb
Syntax relationships Argument Transitivity Valency Branching Serial verb construction Traditional grammar Predicate Subject Object Adjunct Predicative
Semantics Contrast Mirativity Thematic relation Agent Patient Topic and Comment Focus Volition Veridicality
Phenomena Agreement Polypersonal agreement Declension Empty category Incorporation Inflection Markedness
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In grammar, a complement is a word, phrase, or clause that is necessary to complete the meaning of a given expression.^[1]^[2] Complements are often also arguments (expressions that help complete the meaning of a predicate).

^ See Crystal (1997:75).
^ See Matthews (1981:142f.) and Huddleston (1988:note 2) for good overviews of the different uses of the term complement.