The future perfect continuous, also sometimes called the future perfect progressive,
is a verb tense that describes actions that will continue up until a point in the future.
Structure: Subject + will have been + Present participle (-ing) form + time reference
Here's how to make the positive:
I will have been working
You will have been sleeping
She will have been studying
He will have been cooking
It will have been raining
We will have been exercising
They will have been travelling
To make the negative, just add 'not':
I will not have been working
You will not have been sleeping
She will not have been studying
He will not have been cooking
It will not have been raining
We will not have been exercising
They will not have been travelling
Here are the past simple 'yes / no' questions :
Will I have been working?
Will you have been sleeping?
Will she have been studying?
Will he have been cooking?
Will it have been raining?
Will we have been exercising?
Will they have been travelling?
To make 'wh' questions with 'be' (the question word just goes at the beginning, everything else is the same):
Where will I have been working?
Why will you have been sleeping?
Where will she have been studying?
What will he have been cooking?
How long will it have been raining?
Where will we have been exercising?
How long will they have been travelling?
Usage:
To emphasize the duration of some action that will be completed at some another point in the future.
By the end of this year, I will have been completing my graduation for two years.
Time expression
I will have been watching TV for two hours by the time he comes home.