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The 12 pages that link to Agreement (linguistics), each with the reason it gives.
Noun classRelated: Agreement is the main way noun classes become visible beyond the noun itself.
PronounRelated: Pronouns may match their antecedents or other words in grammatical features.
VerbRelated: In some languages, verbs agree with subjects in person or number.
Word orderRelated: Agreement can help identify relations when words shift position.
DeclensionRelated: Declined adjectives often agree with the nouns they modify.