An equative clause is a clause which describes a feature of its subject . It contains a subject complement and, typically, a copula .
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Pike, Kenneth L., and Evelyn G. Pike. 1982.Grammatical analysis. Dallas, TX: Summer Institute of Linguistics.
Hartmann, R.R.K., and F.C. Stork. 1972.Dictionary of language and linguistics. London: Applied Science.
Crystal, David. 1980.A first dictionary of linguistics and phonetics. Boulder, CO: Westview.