Summary

Thomas Wood,  Practical Grammar and Composition

“ Do not use incorrect contractions of the verb with not. Don't cannot be used with he or she or it, or with any other singular subject in the third person. One should say, He doesn't, not he don't; it doesn't, not it don't; man doesn't, not man don't. The proper form of the verb that is being contracted in these instances is does, not do. Ain't and hain't are always wrong; no such contractions are recognized. Such colloquial contractions as don't, can't, etc., should not be used at all in formal composition. ”
Source: Gutenberg

Thomas Wood,  Practical Grammar and Composition

“ A Verb-phrase is a phrase that serves as a verb; as, I am coming, He shall be told, He ought to have been told.
7. A Clause is a group of words containing a subject and a predicate; as, The man that I saw was tall. The clause, that I saw, contains both a subject, I, and a predicate, saw. This clause, since it merely states something of minor importance in the sentence, is called the Subordinate Clause. The Principal Clause, the one making the most important assertion, is, The man was tall. Clauses may be used as adjectives, as adverbs, and as nouns.
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Source: Gutenberg

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