A copula is “That part of a proposition which connects the subject and predicate; the present tense of the verb to be (with or without a negative) employed as a mere sign of predication.” It uses a linking verb to describe the subject, so is always either another noun or an adjective. Other verbs that can sometimes function as copulas include seem, appear, become, and remain, as well as the sense verbs look, sound, taste, smell, and feel.
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