THE FUTURE PERFECT TENSE
The form is:
SIMPLE FUTURE OF "TO HAVE" + PAST PARTICIPLE OF THE MAIN VERB
The Future Perfect Tense refers to a completed action in the future. Is used in conjunction with such expressions as by the time, by this time, or by.
By the time we get there, the movie will have already starded.
The expression by the time can introduce either a past or a future idea.
The Future Perfect Tense refering to a completed action in the future is also used in clauses following such a verbs as believe, expect, hope, suppose or expressions of certainty.
I'm pretty sure she'll have received my envelope by the end of this week.
THE INTERROGATIVE FORM OF THE FUTURE PERFECT TENSE
How much will I have spent on clothes by September?
THE NEGATIVE FORM OF THE FUTURE PERFECT TENSE
I will not have spent on clothes by September.
I won't have spent on clothes by September.
BY THE TIME
This expression can introduce either a past or a future idea:
By the time we get there, the soap-opera will have already started.
By the time we got there, the soap-opera had alread started.
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