Future Perfect Continuous forms

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Future Perfect Continuous Tense is built with will have been in all persons and present participle ( verb form with the ending -ing).

	Affirmative sentences	contractions
I	I will have been writing a letter.	I'll have been writing a letter.
you	You will have been writing a letter.	You'll have been writing a letter.
he	He will have been writing a letter.	He'll have been writing a letter.
she	She will have been writing a letter.	She'll have been writing a letter.
it	It will have been writing a letter.	It'll have been writing a letter.
we	We will have been writing a letter.	We'll have been writing a letter.
you	You will have been writing a letter.	You'll have been writing a letter.
they	They will have been writing a letter	They'll have been writing a letter.

	Negative sentences	contractions
I	I will not have been writing a letter.	I won't have been writing a letter.
you	You will not have been writing a letter.	You won't have been writing a letter.
he	He will not have been writing a letter.	He won't have been writing a letter.
she	She will not have written a letter.	She won't have written a letter.
it	It will not have been writing a letter.	It won't have been writing a letter.
we	We will not have been writing a letter.	We won't have been writing a letter.
you	You will not have been writing a letter.	You won't have been writing a letter.
they	They will not have been writing a letter.	They won't have been writing a letter.

	Questions
I	Will I have been writing a letter?
you	Will you have been writing a letter?
he	Will he have been writing a letter?
she	Will she have been writing a letter?
it	Will it have been writing a letter?
we	Will we have been writing a letter?
you	Will you have been writing a letter?
they	Will they have been writing a letter?