Future perfect tense:  

Definition: ভবিষ্যৎ কালে কোন কাজ কোন উল্লিখিত সময়ের আগে সমাপ্ত হবে বুঝালে তাকে Future perfect tense বলে।                                                                                                                                                         1.   Choose the correct tense.
Sorry, Jake, I ___ late tomorrow, I’m afraid.

 ’ll have been  
 ’ll be  
 ’ll be being    

Future perfect                                                                                                                                                                               Use:

• Use the future perfect to talk about an event that will be finished and complete before a specified time in the future.

This time next week, I’ll will have finished this project.                                                                                                                                     Phrases often seen with this use of the future continuous include:
By ..., This time next week...,  In __ years’ time...; when + present simple; by the time + present simple.
When you arrive, I’ll have prepared the dinner.
By the time I get home, my mum will probably have tidied the house.

• The future perfect is also use to make predictions about future events that will be complete before a specified future time.

Do you think Mel will have eaten all the chocolate cake?
No, she won’t have done that! 

Form:
Make the future continuous this way:

Positive and Negative: Subject + Shall have/ will have/ shan’t have/ won’t have + V3+(Extension).

I / we	Shall have/ shan’t have	past participle
You  he / she / it  they	Will have/won’t have

Example: We shall have finished the work.                                                                                                                                 

 She won’t have cooked food.

Questions: Shall/ Will /Shan’t/  Won’t + sub+ have+ V3+(Extension)?

Shall / shan’t	I / we	have	past participle?
Will / won’t	You  he / she / it /  they

                                                                                                                                           

Example: Will he have written the story?

Be going to is rarely used to make the future perfect tense.
Tom’s going to have finished his lecture by the time we get there.