TOEFL PREPARATION MODUL from BARRON : Problems with HAVE + PARTICIPLE

Have, has, or had + participle express duration of time.

14. Prediction – Will Have + Participle

Remember that will have followed by a participle and a future adverb expresses a prediction for a future activity or event.

Adverb (future) + such a + will + have + participle

Ex: By the year 2010, researcher will have dicovered a cure for cancer

Avoid using will instead of will have.

Example :

            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.

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.

Exercise :

                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 (a) that by 2010(b) immunotherapy have succeeded (c) in curing (d) a number of serious illnesses.