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§ 2. The Use of the Future Perfect

We use the Future Perfect to denote:

  1. An action completed before a definite moment in the future

  • with the adverbials by 2 o’clock, by then, by Saturday, by the end of the year, by 2008, not … till/until, before he comes, by the time he comes, etc.

E.g. They will have got the telegram by morning/by the time they return.

I won’t have left until Wednesday.

  1. An action which begins before a definite moment in the future, will continue up to that moment and will still be in progress at that moment

  • This use of the Future Perfect we call the Future Perfect Inclusive.

  • The preposition FOR denotes the whole period of duration of the action.

  • The adverbials by that time, (by) next week, (by) next Sunday, by the time he comes, when he comes, when she is 20, before she gets home, etc. denote a definite moment in the future.

E.g. She will have been a student for a year by next September.

THE FUTURE PERFECT CONTINUOUS TENSE

(THE FUTURE PERFECT PROGRESSIVE)

§ 1. The Formation of the Future Perfect Continuous

  1. We form the Future Perfect Continuous by means of the auxiliary verb TO BE in the Future Perfect (will have been) and Participle I of the main verb.

WILL HAVE BEEN + PARTICIPLE I (Ving)

E.g. I will have been writing the letter for two hours when he comes.

She will have been reading the book for a week by next Monday.

In informal English we can also use short affirmative forms.

Full affirmative forms

Short affirmative forms

I (he, she, it, we, you, they) will have been working.

I (he, she, it, we, you, they)’ll have been working.

  1. In negative sentences we place the negative particle NOT after the first part (will) of the auxiliary verb TO BE. In informal English we use short negative forms.

E.g. I will not/won’t have been writing the letter for two hours when he comes.

She will not/won’t have been reading the book for a week by next Monday.

Full negative forms

Short negative forms

I (he, she, it, we, you, they) will not have been working.

I (he, she, it, we, you, they) won’t have been working.

  1. In interrogative sentences (questions) we place the first part (will) of the auxiliary verb TO BE before the subject.

E.g. Will I have been writing the letter for two hours when he comes?

Will she have been reading the book for a week by next Monday?

  1. In negative-interrogative sentences (negative questions) we place the first part (will) of the auxiliary verb TO BE before the subject and the negative particle NOT after the subject. In informal English we place short negative forms before the subject.

E.g. Will I not/Won’t I have been writing the letter for two hours when he comes?

Will she not/Won’t she have been reading the book for a week by next Monday?

Full negative-interrogative forms

Short negative-interrogative forms

Will I (he, she, it, we, you, they) not have been working?

Won’t I (he, she, it, we, you, they) have been working?

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