For the infinitive clause replacing a that-clause as object, see [§§ 324–325].

389. A noun clause may be used as the retained object of a passive verb ([§ 253]).

Active Voice (Clause as Object)Passive Voice (Retained Object)
They informed me that the train was late.I was informed that the train was late.
Charles told us that the ice was thin.We were told that the ice was thin.
They asked me whether (or if) I liked tennis.I was asked whether I liked tennis.

390. A noun clause may be the object of a preposition.

For a noun clause used as an adverbial objective, see [§ 384].

391. Noun clauses with that are common in the predicate when the expletive it is the grammatical subject ([§ 120, 2]).

In such sentences the real subject of the thought is the clause. This, however, may be regarded as grammatically in apposition with it, as if one said “It (that war was at hand) was plain.”