Complement

Definition and stakes

Brainerd Kellogg,  Higher Lessons in English: A work on English grammar and composition

“ Give the substance of the "Introductory Hints" (for example, show clearly what two things are essential to a complete predicate; explain what is meant by a complement; distinguish clearly the three kinds of complements; show what parts of speech may be employed for each, and tell what general idea—action, quality, class, or identity—is expressed by each attribute complement or objective complement in your illustrations, etc.) . Repeat and illustrate definitions and rules; explain and illustrate fully the distinction between an adjective complement and an adverb modifier ”
Source: Gutenberg

Thomas Wood,  Practical Grammar and Composition

“ When the noun or pronoun is the subject of a finite verb; that is, a verb other than an infinitive. See 3 under Objective Case.
2. When it is an attribute complement. An attribute complement, as explained in Chapter I, is a word used in the predicate explaining or stating something about the subject. Examples: It is I, The man was he, The people were they of whom we spoke.
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Source: Gutenberg

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