Remember that will have followed by a participle and a future adverb expresses a prediction for a future activity or event.
Adverb (future)
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Such as
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will
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have
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participle
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By the year 2010,
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researchers
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will
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have
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discovered
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a cure for cancer
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Avoid using will instead of will have.
INCORRECT : You will finished your homework by the time the movie starts.
CORRECT : You will have finished your homework by the time the movie starts.
CORRECT : You will have finished your homework by the time the movie starts.
INCORRECT : Jan will left by five o'clock.
CORRECT : Jan will have left by five o'clock.
INCORRECT : Before school is out, I have returned all of my library books.
CORRECT : Before school is out, I will have returned all of my library books.
INCORRECT : We have gotten an answer to our letter by the time we have to make a decision.
CORRECT : We will have gotten an answer to our letter by the time we have to make a decision.
INCORRECT : Before we can tell them about the discount, they will bought the tickets.
CORRECT : Before we can tell them about the discount, they will have bought the tickets.
Exercises
Part A: Choose the correct answer.
By the middle of the twenty-first century, the computer ________ a necessity in every home.
(A) became
(B) becoming
(C) has become
(D) will have become
Part B: Choose the incorrect word or phrase and correct it.
It is believed that by 2010 immunotherapy have succeeded in curing a number of serious illnesses.
(A) (B) (C) (D)
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