The Future Perfect Continuous or Progressive Tense isn’t used very much in English and it is also a little complicated to make. The tense indicates a continuous action that will be completed at some point in the future. This tense is formed with the modal “WILL” plus the modal “HAVE” plus “BEEN” plus the present participle of the verb (with an -ing ending): “Next Thursday, I will have been working on this project for three years.”
Situations where Future Perfect Continuous or Progressive Tense are used:-
1. Duration Before Something in the Future
- They will have been talking for over an hour by the time Steve arrives..
- How long will you have been studying when you graduate?
- By the next year, John and his wife will have been living together for 30 years.
2. Cause of Something in the Future
- Ali will be very tired when he gets home because he will have been jogging for over two hours.
- We will be making a rest stop in half an hour, because you will have been driving the car for 4 hours by then, and feeling very tired.
|To note :-1) You can use either “will” or “be going to” to create the Future Perfect Continuous with little or no difference in meaning
2) Like all future forms, the Future Perfect Continuous cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc. Instead of Future Perfect Continuous, Present Perfect Continuous is used.
3) Non-Continuous Verbs cannot be used in any continuous tenses. Also, certain non-continuous meanings for Mixed Verbs cannot be used in continuous tenses. Instead of using Future Perfect Continuous with these verbs, you must use Future Perfect .