III. NOUN (OR SUBSTANTIVE) CLAUSES

385. A subordinate clause that is used as a noun is called a noun (or substantive) clause ([§ 47]).

In each of these groups a noun (agreement, victory, etc.) is replaced (1) by an infinitive, (2) by a noun clause. In the first two examples, the noun clause is the subject; in the last two, it is the object of a verb (feared, expect).

386. Noun clauses may be used in any of the more important constructions of nouns:—(1) as subject, (2) as direct object of a transitive verb, (3) in apposition with a substantive, (4) as a predicate nominative.

387. Noun clauses may be introduced (1) by the subordinate conjunctions that, whether (whether ... or), and if (in the sense of whether); (2) by the interrogative pronouns who, which, what; (3) by the interrogative adverbs where, whence, whither, how, why, when ([§ 196]).

388. Noun clauses are common as objects of verbs (1) of commanding, desiring, etc.; (2) of telling, thinking, etc.; (3) of asking, doubting, etc.

See (1) clauses of purpose ([§ 406]); (2) indirect discourse ([§§ 431–437]); (3) indirect questions ([§ 443]).

Object clauses frequently omit that ([§ 367]).