Future Perfect Continuous

Form

This form is composed of two elements: the future perfect of the verb to be (will have been) + the present participle of the main verb (base+ing):

Subject	will have been	base+ing
We	will have been	living

Affirmative
I	will have been	working
Negative
I	won't have been	working
Interrogative
Will	I have been	working?
Interrogative negative
Won't	I have been	working?

Example: to live 

Affirmative	Negative	Interrogative
I'll have been living	I won't have been living	Will I have been living?
You'll have been living	You won't have been living	Will you have been living?
He'll have been living	He won't have been living	Will she have been living?
We'll have been living	We won't have been living	Will we have been living?
You'll have been living	You won't have been living	Will you have been living?
They'll have been living	They won't have been living	Will they have been living?

Function

Like the future perfect simple, this form is used to project ourselves forward in time and to look back. It refers to events or actions in a time between now and some future time, that may be unfinished.

Examples:

• I will have been waiting here for three hours by six o'clock.
• By 2001 I will have been living here for sixteen years.
• By the time I finish this course, I will have been learning English for twenty years.
• Next year I will have been working here for four years.