Usage
The future perfect is a verb tense used for actions that will be completed before some other point in the future.
We use the future perfect to say ‘how long’ for an action that starts before and continues
up to another action or time in the future.
Do you think you will have finished it by next Thursday?
I think astronauts will have landed on Mars by the year 2019.
At 4 o’clock, I’ll have been in this office for 24 hours.
Form
The formula for the future perfect tense is pretty simple: will have + [past participle].
Here's the negative:
I will not have finished this book
You will not have studied the English tenses
To make the question, just put 'will' before the subject:
'Yes / no' questions:
By next year, will I have finished writing this book?
By next year, will you have studied all the English verb tenses?
'Wh' questions:
When will I have finished writing this book?
Why will you have studied all the English verb tenses by tomorrow?
The future perfect tense is only for actions that will be complete before a specified point in the future. In other words, the action you’re talking about must have a deadline. If you don’t mention a deadline, use the simple future tense instead of the future perfect tense.
Mahmoud will leave.
Mahmoud will have left.
The deadline can be very specific (eight o’clock) or it can be vague (next week). It can even depend on when something else happens (after the parade ends). It just has to be some time in the future.
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