Future Perfect has two different forms: "will have done" and "be going to have done." Unlike Simple Future forms, Future Perfect forms are usually interchangeable.
[will have + past participle]
Examples:
[am/is/are + going to have + past participle]
Examples:
NOTE: It is possible to use either "will" or "be going to" to create the Future Perfect with little or no difference in meaning.
Affirmative | Negative | Interrogative |
I will have stopped. You will have stopped. We will have stopped. They will have stopped. He will have stopped. She will have stopped. It will have stopped. |
I will not have stopped. You will not have stopped. We will not have stopped. They will not have stopped. He will not have stopped. She will not have stopped. It will not have stopped. |
Will I have stopped? Will you have stopped? Will we have stopped? Will they have stopped? Will he have stopped? Will she have stopped? Will it have stopped? |
Affirmative | Negative | Interrogative |
I am going to have stopped. You are going to have stopped. We are going to have stopped. They are going to have stopped. He is going to have stopped. She is going to have stopped. It is going to have stopped. |
I am not going to have stopped. You are not going to have stopped. We are not going to have stopped. They are not going to have stopped. He is not going to have stopped. She is not going to have stopped. It is not going to have stopped. |
Am I going to have stopped? Are you going to have stopped? Are we going to have stopped? Are they going to have stopped? Is he going to have stopped? Is she going to have stopped? Is it going to have stopped? |
The Future Perfect expresses the idea that something will occur before another action in the future. It can also show that something will happen before a specific time in the future.
Examples:
Notice in the examples above that the reference points (marked in italics) are in Simple Present rather than Simple Future. This is because the interruptions are in time clauses, and you cannot use future tenses in time clauses.
With Non-Continuous Verbs and some non-continuous uses of Mixed Verbs, we use the Future Perfect to show that something will continue up until another action in the future.
Examples:
Although the above use of Future Perfect is normally limited to Non-Continuous Verbs and non-continuous uses of Mixed Verbs, the words "live," "work," "teach," and "study" are sometimes used in this way even though they are NOT Non-Continuous Verbs.
Like all future forms, the Future Perfect cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc. Instead of Future Perfect, Present Perfect is used.
Examples:
The examples below show the placement for grammar adverbs such as: always, only, never, ever, still, just, etc.
Examples:
Examples: