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Future Perfect Continuous Tense

This tense is used to describe an ongoing action that will complete in future. It is used to express the ongoing nature of an action with regards to its continuation towards a point in future. The action is assumed to be continued for a time (specified or unspecified) in future.

A ‘time-reference’ is used in the sentence to show starting time of the action or for how long the action continues.

For time-reference of the action, two specific words ‘since’ and ‘for’ are used in the sentence. The word ‘since’ is used if the exact starting time (e.g. Friday, since 10 A.M) of the action is known or intended to be shown in the sentence. The word ‘for’ is used to express the amount of time (e.g. for five hours, for nine months) for which the action continued towards a point in future.

Structure of Sentence:

Main Verb: Present Participle (Base or 1st form of verb + ing) e.g. going, living working.
Auxiliary verb:  Will have been

   POSITIVE SENTENCES

  Subject + Auxiliary verb + Main Verb + Object + Time-reference
 Subject + Will have been + Present Participle (1st form of verb + ing) + Object + time-reference

Examples:
They will have been living in Paris for five years.
The Kid will have been sleeping since 10 PM.
The doctor will have been treating patients for two years.
He will have been reading this book since 10 AM.
He will be working as an engineer in this factory since January.
We will have been starting your business since May.
You will have been using my computer for five months.
She will have been singing songs for three hours.
They will have been discussing about the issue for five days.
They will have been writing essays for two hours.

   NEGATIVE SENTENCES:

  Subject + Auxiliary verb + Main Verb + Object + Time-reference
 Subject + Will NOT have been + Present Participle (1st form of verb + ing) + Object + time-eference

Examples:
He will not have been working in the factory for six months.
She will not have been playing games since November.
They will not have been using this car since March.
The company will not have been advertising posts for two years.
He will not have been listening to music for nine hours.
She will not have been washing her dresses since June.
I will not haven waiting for you for four hours.
He will not have been running his business since April.
She will not have been living here for five years.

   INTERROGATIVE SENTENCES:

 Will + Subject + Have been + Present Participle (1st form of verb + ing) + Object

Examples:
Will he have been loving her for five years?
Will she have been studying in the new college since December?
Will they have been working in this factory since June?
Will the kids have been making a noise for three hours?
Will they have been using their phone since Tomorrow?
Will you have been eating vegetables for three months.

Will she have been singing songs since Monday?
Will he have been taking medicine for his illness since Friday?
Will I have writing essays for Newspaper since Monday?
Will she have been teaching the kids since Morning?