Future Perfect Continuous

USES:
- To show cause and effect.
- To say that something is going to continue until the next future action: for.


2 FORMS:

- AFFIRMATIVE: Subject + Will have been + Verb -ing
I will have been living in Italy for 4 years by the time I finish my studies.    

                            Subject + Be (present) going to have been + Verb -ing  
I am going to have been living in Italy for 4 years by the time you finish your studies.      

- NEGATIVE: Subject + Will not have been + Verb -ing       *Will not have = Won't have*
I won't have been living in Italy for 4 years by the time I finish my studies.

                          Subject + Be not (present) going to have been + Verb -ing  
I am not going to have been living in Italy for 4 years by the time you finish your studies. 
               

- QUESTION: Will  + Subject + Have been + Verb -ing + Complements?     
Will you have been living in Italy for 4 years by the time you finish your studies?

                           Be (present)  + Subject + Going to have been + Verb -ing + Complements?     
Are you going to have been living in Italy for 4 years by the time you finish your studies?

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