The Future Perfect

§ 43. The Future Perfect is an analytical form which is built
up by means of the auxiliary verb to have in the Future Indefi-
nite and the participle of the notional verb (e.g. I shall have read
the book by that time, He will have read the book by that time,
etc.). (On the formation of the Future Indefinite see "Verbs",
§ 38; on the formation of the participle see "Verbs", § 5.)

In the interrogative form the first auxiliary verb is placed be-
fore the subject (e.g. Will she have read the book by that time?
Will you have read the book by that time?, etc.). In the negative
form the negative particle not is placed after the first auxiliary
(e.g. We shall not have read the book by that time. They will not
have read the book by that time, etc.).

In spoken English the contracted form '11 is used with all the
persons in affirmative sentences and shan't and won't in negative
sentences.

§ 44. The Future Perfect is used to express an action accom-
plished before a given future moment which is usually indicated
by an adverbial modifier.

e.g. I daresay you'll have gone to bed by the time I've finished.
I suppose we shall have made up our minds whom we are go-
ing to elect before the meeting.

The Future Perfect is not used very often owing to the fact
that it is seldom required by the situation.