The Present Perfect is used to describe

When not to use the future perfect tense
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.
Correct : Linda will leave.
İncorrect : Linda 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.
The future perfect negative
Making a negative future perfect construction is easy. Just insert not bet-ween will and have.
Example : We will not have eaten breakfast before we get to the airport tomorrow morning. They will not have finished decorating the float before the parade.
You can also use the contraction won’t in the place of will not. They won’t have finished decorating the float before the parade.
How to Ask a Question with the future perfect tense
The formula for asking a question in the future perfect tense is will + [subject] + have + [past participle]
Example : Will you have eaten lunch already when we arrive? Will they have finished decorating the float before the parade?

Future-perfect-in-past
Definition: 
Future-perfect-in-past tense is an absolute-relative tense that involves three points in time in the past. The tense refers to a time that is in the future, relative to another point in the past, but is in the past relative to a point in its future. All these points in time are in the past relative to the moment of utterance.
Examples: John left for the front; by the time he should return, the field would have been burnt to stubble.
To make a sentence negative, we can add a negation to the first or second part.As I said above, in this part we use the Past Simple tense. The auxiliary verb of this tense is did. Therefore, to form a negation, we need to add the negative particle not to did.
They are usually abbreviated like this: did + not = didn't
Example: She said (that) she wouldn't have cooked dinner by 4 o'clock
They said (that) they wouldn't have read all these books by morning.
At the same time, the action itself will now stand in its initial form, that is, it will not change in any way (say, tell, hope). The scheme for the formation of such a sentence:
Negation in the second part To make the second part negative, we need to put not after would.
We can shorten: would + not = wouldn't
Example : Did they think (that) they would have translated the article by evening?
Did she say (that) she would have finished the report by the next week?