Future perfect continuous

É usado para falar sobre uma contínua e longa ação que estará completa em algum momento do futuro.

Estrutura:

Afirmativa: Sujeito + will have been + verbo(ing) + obj. + (time expression)
Negativa: Sujeito + will not have been + verbo(ing) + obj. + (time expression)
Interrogativa: (wh) + will + subj. + have been + verb(ing) + obj. + (time expression)?

Exemplos de expressões de tempo:

by next month
by next year
since 1994
for 5 months

Exemplos:

By the end of next month, I will have been living in Rome for 18 years
How long will you have been learning English by the end of this year?
By June 2016 I will have been living in Malta for two years
I will have been waiting here for three hours by six o'clock.
By 2001 I will have been living in London for sixteen years.
When I finish this course, I will have been learning English for twenty years.
Next year I will have been working here for four years.
When I come at 6:00, will you have been practicing long?
 
Exemplo do FUTURE PERFECT CONTINUOUS com PRESENT SIMPLE:

He will have been waiting for more than one hour when she finally calls him

Exemplos com todas as pessoas na ordem afirmativa, negativa, interrogativa e interrogativa negativa:

I will have been living
I won't have been living
Will I have been living?
Won't I have been living?
   
You will have been living
You won't have been living
Will you have been living?
Won't you have been living?

He will have been living
He won't have been living
Will he have been living?
Won't he have been living?

We will have been living
We won't have been living
Will we have been living?
Won't we have been living?

They will have been living
They won't have been living
Will they have been living?
Won't they have been living?