Future Perfect

The Future Perfect tense is used to express an action or state that will finish sometime in the future before another event in the future.

It is formed by using the auxiliary verb will followed by the verb have and the past participle of the main verb.

The verb form of the Future Perfect tense: will + have + past participle (verb 3)

I will have eaten…

You can contract this tense by combining the subject and will

I’ll have eaten…

To say an action is complete before another action

We use the Future Perfect tense to say that something was finished before a certain time or before another event.

This will be used in a 2 clause sentence, and the Future Perfect clause will be the action that was completed before the other action. The other clause will be Present Simple tense.

When the sun sets, we will have gone.

I will have seen this movie three times after we watch it

I will have finished my homework before my mom arrives.

To say a future action will finish at a certain time

We can use this tense to speak about a future action or event that will be finished before a certain time, but we don’t know the exact time.

We usually use the prepositions by or before, or prepositional phrases: by the time, by six o’clock with this use.

By Friday, I will have completed my research paper.

I will have gone home by nine o’clock.

I will have retired by the time I’m thirty.