The Future Perfect Uses

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:
[will have + past participle]

Examples:
 

• You will have perfected your English by the time you come back from the U.S.


• Will you have perfected your English by the time you come back from the U.S.?

 
USE : Completed Action Before Something in the Future

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:
 

• By next November, I will have received my promotion.
  
• Will she have learned enough  Chinese to communicate before she moves to Beijing?
   
• By the time I finish this course, I will have taken ten tests.      
   
                                                                  

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Other Examples:

Positive
 

• 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.
   

Negative
 

• 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.

Question
 

• 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?