The Future Perfect is used to talk about an event or action that will be finished before a certain event or time in future:

 

They will have built the house (the house will be ready) by February (‘by’ here means ‘before’).

 

To make the Future Perfect, use:

 

Will have + the past participle form of the verb.

 

Singular	Plural
I will have (I’ll have) finished You’ll have finished He/she/it will have finished	We’ll have finished You’ll have finished They’ll have finished

 

Jack will have read all his books by next month.

 

The next time you see me, I’ll have had a haircut.

 

We are late! The play will have started by the time we get to the stadium.