The Future Perfect Continuous Tense is also known as the future perfect progressive tense. The Future Perfect Continuous Tense is used to describe an action that will continue to a specific time in future.
subject + will + have + been + v1(ing)
AFFIRMATIVE FORM
Examples:
You will have been dancing to the music.
I will have been cooking.
We will have been doing our homework.
It will have been raining.
She will have been waiting for him.
Time's up
NEGATIVE FORM
subject + will + not + have + been + v1(ing)
Example:
She will not have been studying/ She won’t have been studying.
I will not have been writing the letter/ I won’t have been writing the letter.
He will not have been staying in London / He won’t have been staying in London.
They will not have been playing tennis / They won’t have been playing tennis.
We will not have been enjoying tomorrow / We won’t have been enjoying tomorrow.