The future perfect continuous tense describes a continued action at some point in the future, is composed of two elements :
the future perfect of the verb “to be” (will have been) + the present participle of the main verb (base + ing)
|Subject||+ will have been||+ present participle|
|He||will have been||working.|
|I||will have been||working.|
The future perfect:
- has the form will + have + been + verb-ing.
For example: He will have been travelling for six months by the time he goes to Spain.
- describes continued actions that are continuing at a specific point in the future.
For example: We should hurry because Barbara will have been waiting for us for ten minutes already.
- uses “not” in negative form.
For example: We’re early, so Barbara will not have been waiting for us yet.