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 continues towards a pint in future .

Structure of sentence :

Main verb :  present participle ( Base or 1^st 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(1^st 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 (1^st form of verb + ing ) + object + time – reference

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 have been 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 .

Note : the short form of ‘ will not ‘ is ‘ won’t ‘ . therefore , the negative sentence can also be written with ‘ wont have been ‘ instead of ‘ will not have been ‘  see the following example :

He will not have been using his camera for two days .

He won’t have been using his camera for two days

Interrogative sentence :

Will + subject +have been + present participle (first 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 noise for three hours ?

Will they have been using their phone since yesterday ?

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 written essays foe newspaper since Monday ?

Will she have been teaching the kids since morning ?