Future Perfect

Positive:
By the time they arrive, I will have repaired it, it will be OK.
They will have met each other before conference.
We will not be hungry. We will have eaten by then.
He will have visited 100 countries by the time he turns 40.
She will have read 10 books by next September.

Negative:
By the time they arrive, I will not have repaired it.
It will be broken. They will not have met each other before conference.
We will be hungry. We will not have eaten by then.
He will not have visited all countries by the time he turns 40.
She will not have read 10 books by next September.

Question:
Will I have repaired it by the time they arrive? Will it be OK?
Will they have met each other before conference?
Will we be hungry? Will we have eaten by then?
Will he have visited all countries by the time he turns 40?
Will she have read 10 books by next September?

Usage: We use the Future Perfect Tense to say that something will already be completed before a time in the future. It refers to a completed action in the future.

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