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The future perfect continuous tense is a tense in modern English. Used to describe an action that has been happening up to a point in the future
In there:
- S (subject): Subject
- Will & have: Auxiliary verb
- Been: II participle of "to be" (verb to be)
- V-ing: Verbs add "ing" ending
S + will + have + been + V-ing
✎ NOTE:
- "been" always comes last "have".
- Passive sentence form of future perfect continuous tense: Will + have + been + being + V3/ed (For example: Nobody has any clue as to who will have been being elected president during the 2034 term of the presidency. => Nobody has any clue who will be elected president in the 2034 presidential term.)
For example:
- By the end of this year, I will have been playing chess for 2 years.
- At the end of this month, she will have been learning yoga for 2 months.
S + will + not + have + been + V-ing
✎ NOTE: We just need to add "not" right after the auxiliary verb "will" and we can write "will not" as "won't".
For example:
- I won't have been playing sports for 3 months until the end of this year.
- I won't have been shopping for 3 months until the end of the year.
Will + S + have + been + V-ing ?
Reply:
- Yes, S + will
- No, S + won't
✎ NOTE:
Interrogative sentences move the auxiliary verb "will" to the beginning.
Questions using "what, how, when, why,..." have the form: Wh-word + will + S + have + been + V-ing ? (For example: How long will you have been playing chess by the end of the year? => How long will you have played chess by the end of this year?)
For example:
- Will she have been teaching for 5 years by the end of next year?
- Will you have been playing basketball for 2 years by the end of this month? Are you going to have played basketball for 2 years by the end of this month?
3.1. Expresses an action that occurs and continues continuously until a certain time in the future
For example:
I will have been studying English for 10 year by the end of next year.
By August 20th, I will have been working for this company for 20 years.
– by then: until then
– by this December,…: as of December this year
– by the end of this week/month/year: as of this weekend/this month/this year
– by the time+ 1 clause in the present simple tense
➣ The future perfect continuous tense is not used with clauses that begin with words of time such as: when, while, before, after, by the time, as soon as, if, unless... Instead, you can Can use present perfect continuous tense.
For example:
You won’t get a promotion until you will have been working here as long as Tim (false)
=> You won’t get a promotion until you have been working here as long as Nad. (true)
(You won't get promoted until you've worked as long as Nad.)