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.

Time's up
INTERROGATIVE FORM
Will + subject + have + been + v1(ing)

Examples:
- Will I have been practicing?
- Will I have been studying?
- Will you have been playing?
- Will you have been reading?
- Will we have been working?
- Will he have been singing?
- Will she have been dancing?
- Will she have been writing?
- Will my mother have been cooking?
- Will John have been going?

Time's up