Complement: This is a noun, pronoun, or adjective that follows and completes the idea expressed by a linking verb. Linking verbs (sometimes called copulative verbs) do not express action but rather connect the subject to additional information; they signify S = C. The main linking verbs are forms of the verbs to be, to become, to seem. If the complement is a noun or pronoun, it is sometimes called predicate nominative; if an adjective, predicate adjective.