I. The formation of the Future Perfect Continuous Tense
The Future Perfect Continuous is formed by means of the Future Perfect of the auxiliary verb to be and Participle I of the notional verb.
In the interrogative formthe first auxiliary verb is placed before the subject.
In the negative formthe negative particle not is placed after the first auxiliary verb.
Affirmative
Negative
I shall have been working
I shall have not been working
You will have been working
You will have not been working
He/she/it will have been working
He/she/it will have not been working
We shall have been working
We will have not been working
They will have been working
They will have not been working
Interrogative
Shall I have been working?
Will you have been working?
Will he/she/it have been working?
Shall we have been working?
Will they have been working?
II. The contracted affirmative forms are:
I’ll have been working
We’ll have been working
The contracted negative forms are:
I shan’t have been working
He won’t have been working
The negative-interrogative forms are:
Will he not have been working?
Won’t he have been working?
Shall we not have been working?
Shan’t we have been working?
III.The use of the Future Perfect Continuous
The Future Perfect Continuous denotes an action begun before a definite moment in the future and continued into that future moment;
I shall have been writing for two hours by the time you come back.
By the first of July he will have bee working at this office for six months.
THE FUTURE-IN-THE-PAST TENSE
The English language has a special form of the future, the Future-in-the-Past, to express a future action viewed from a past moment (sequence of tenses). If the verb in the principal clause is in one of the past tenses, a past tense (or Future-in-the-Past) must be used in the subordinate clause. If the action expressed in the principal clause is posterior to that of the principal clause the Future-in-the-Past is used.
THE FUTURE-INDEFINITE-IN-THE-PAST
I. The formation of the Future-Indefinite-in-the-Past
The Future-Indefinite-in-the-Past is formed by means of the auxiliary verbs should and would and the infinitive without to of the notional verb.
Shouldis used for the first person singular and plural.
Would is used for the second and the third person singular and plural.
In the interrogative formthe auxiliary verb is placed before the subject.
In the negative form the negative particle not is placed after the auxiliary verb.