Future Perfect

USES:
- To talk about actions that have already finished before the next action in the future: by.
- To show that something will continue until the next future action: before. 

2 FORMS:

- AFFIRMATIVE: Subject + Will have + Verb participle    
I will have ended the basketball match by 8pm.    

                             Subject + Be (present) going to have + Verb participle    
I am going to have ended the basketball match by 8pm.      

- NEGATIVE: Subject + Will not have + Verb participle       *Will not have = Won't have*
I won't have ended the basketball match by 7pm.

                          Subject + Be not (present) going to have + Verb participle    
I am not going to have ended the basketball match by 8pm. 
                 

- QUESTION: Will  + Subject + Have + Verb participle + Complements?     
Will you have ended basketball before 8?

                           Be (present)  + Subject + Going to have + Verb participle + Complements?     
Are you going to have ended basketball before 8?

Links to exercises:
Future perfect 1
Future perfect 2
Future perfect 3
Future prefect 4