The choice among these three idioms is largely a matter of emphasis or euphony. The first may easily become heavy or awkward, and it is therefore less common than either of the others.

Note. The third of these idioms is often called the personal construction, to distinguish it from the second, in which the grammatical subject is the impersonal it ([§ 120, 1]). The infinitive in this third idiom may be regarded as a peculiar adverbial modifier of the passive verb.

Further examples of the three constructions with passive verbs of telling, thinking, etc., are the following:—

437. A substantive clause with that is common after it seems, it is true, it is evident, and similar expressions.

This construction is really the same as that in [§ 436, 2].

438. The uses of shall and will, should and would, in indirect discourse are the same as in the direct,[48] with the following exception:—

When the first person with shall or should in direct discourse becomes the second or third person in the indirect, shall or should is retained.