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4.4 Future perfect continuous

Form: future perfect continuous

will + have + been + present participle (verb-ing)

The future perfect continuous (also called the future perfect progressive) is formed with the modal will + perfect continuous infinitive without to (have + been + the present participle -ing form of the verb) in all persons.

Affirmative

SubjectAuxiliaryVerb (perfect continuous infinitive) 
I
You
He/She/It
We
You
They
will have been living here for five years by then.

The following contracted forms are often used in spoken and in informal written language:

I will » I'll
you will
» you'll
he/she/it will
» he'll/she'll/it'll
we will
» we'll
you will
» you'll
they will
» they'll

Negative

SubjectAuxiliarynotVerb (perfect continuous infinitive) 
I
You
He/She/It
We
You
They
will not have been living here for five years by then.

The contracted form won't is often used instead of will not in spoken and in informal written language.

Interrogative

(Question word)AuxiliarySubjectVerb (perfect continuous infinitive) 
How long will I
you
he/she/it
we
you
they
have been living here by then?

Future perfect continuous for continuous events in the future

The future perfect continuous tense is used to express events that will start before a point in time in the future (or have already started) and will still be in progress at that point:

By tomorrow, it will have been raining for four days.
Soon, he'll have been running for 4 hours.