Future perfect

Form

The future perfect is composed of two elements
the simple future of the verb "to have" (will have) + the past participle of the main verb

Subject + will have + past participle of the main verb
He will have finished.
I will have finished.
To arrive, future perfect tense
Affirmative Negative Interrogative Negative Interrogative
I will have arrived I won't have arrived Will I have arrived? Won't I have arrived?
You will have arrived You won't have arrived Will you have arrived? Won't you have arrived?
He will have arrived He won't have arrived Will he have arrived? Won't he have arrived?
We will have arrived We won't have arrived Will we have arrived? Won't we have arrived?
They will have arrived They won't have arrived Will they have arrived? Won't they have arrived?

Function

The future perfect tense refers to a completed action in the future. When we use this tense we are projecting ourselves forward into the future and looking back at an action that will be completed some time later than now. It is most often used with a time expression.

Examples
  • I will have been here for six months on June 23rd.
  • By the time you read this I will have left.
  • You will have finished your report by this time next week.
  • Won't they have arrived by 5:00?
  • Will you have eaten when I pick you up?