Future Perfect Continuous

Form

The future perfect continuous 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 + present participle
He will have been playing.
I will have been playing.
To live, future perfect continuous tense
Affirmative Negative Interrogative Negative Interrogative
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?

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 are unfinished. It is most often used with a time expression.

Examples
  • 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?