The future perfect tense

expresses action in the future before another action in the future. This is the past in the future. For example:

The train will leave the station at 9am. You will arrive at the station at 9.15am. When you arrive, the train will have left.

You can call me at work at 8am. I will have arrived at the office by 8.

They will be tired when they arrive. They will not have slept for a long time.

"Mary won't be at home when you arrive."

"Really? Where will she have gone?"

By next November, I will have received my promotion.

By the time he gets home, she is going to have cleaned the entire house.

I am not going to have finished this test by 3 o'clock.

Will she have learned enough Chinese to communicate before she moves to Beijing?

Sam is probably going to have completed the proposal by the time he leaves this afternoon.

By the time I finish this course, I will have taken ten tests.

How many countries are you going to have visited by the time you turn 50?

You can sometimes think of the future perfect tense like the present perfect tense, but instead of your viewpoint being in the present, it is in the future:

Future Perfect USE 2 Duration Before Something in the Future (Non-Continuous Verbs)

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:

I will have been in London for six months by the time I leave.

By Monday, Susan is going to have had my book for a week.

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.

Group II Non-Continuous Verbs

The second group, called "Non-Continuous Verbs," is smaller. These verbs are usually things you cannot see somebody doing. These verbs are rarely used in continuous tenses. They include:

Abstract Verbs