English Grammar – Future Perfect continuous Tense

In this tense the ‘ing’ form of the verb is used.

The formula for past continuous (Positive) is Subject +Aux. verbs+ V4(ing form)

         Positive                Negative Interrogative
I shall have been writing. I shall not have been writing. Shall I have been writing?
We shall have been writing We shall not have been writing. Shall we have been writing?
You will have been writing. You will not have been writing. Will you have been writing?
He will have been writing. He will not have been writing. Will he have been writing?
She will have been writing. She will not have been writing Will she have been writing?
It will have been writing. It will not have been writing. Will it have been writing?
They will have been writing. They will not have been writing. Will they have been writing?

This Tense is used to express an action which is imagined to began at some point of time in future and continue for sometime. It may be noted that this tense is basically theoretical and rarely used. 

Example :

He will have been using my laptop for five months (Positive sentence)

The company will not have been recruiting people for ten months (Negative sentence)

Will he have been living there for seven years?(Interrogative sentence)

Rules and Uses of Future Perfect Continuous Tense

Future perfect continuous tense is used

  1. To indicate future action using by to show the time with for/since
  2. To express a cause in future for something.
  3. To indicate time period in future before some action occurs

1. To indicate future action using by to show the time with for/since

 To express some action where we need to indicate future action using words like tomorrow, next week etc and for/since with another time is given.

Example:

  • By tomorrow, he will have been working at that factory for three years.
  • By next Monday, she preparing will have been a training module for five days.

2. To express a cause in future for something.

We use future perfect continuous tense when we need to express cause of any future situation.

Example:

  • He will have been preparing a project for two days from tomorrow so he will be taking good sleep today.
  • They will be taking some food because they will have been painting their house for six hours.

3. To indicate time period in future before some action occurs

This future perfect continuous tense is also used to express an action that continues until another event occurs.

Example :

  • They live in the same house before they will have been living in their new house by next June.
  • The students will have been chatting to each other before the teacher enters the classroom.

Note: Non action verbs like to seem or to know are not suited to the future perfect continuous tense. Instead, these verbs can take future perfect tense.

  • On Thursday, I will have been knowing you for a week (Incorrect)
  • On Thursday, I will have known you for a week (Correct)

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