Brief Overview of the Tense
The Future Perfect Continuous Tense is used to indicate that an action will continue up until a particular event or time in the future. By using this tense, we are projecting ourselves forward in time and looking back at the duration of that activity. The tense consists of
Will + have + been + the verb’s present participle (verb root + -ing)
At two o’clock, I will have been waiting for half an hour.
In August, I will have been studying German for two years
All grammar rules for forming the tense
For the questions that can be answered as yes or no, we follow-
Yes/No Sentences = Will + Subject + have been + 1st Verb+ ing+ Object?
Will you have been solving all the math questions?
For the questions that start with wh words (when, why, who, where, whom, how, what, how much, how many), we follow-
WH Sentences = Wh word + will (Helping Verb) + Subject + have been (Auxiliary verb) + 1st Verb+ ing+ Object.
Where will you have been playing Football?
Why will she have been sending me these messages?
3. For the Tag questions we add auxiliary verbs
She will have been studying, will she not have been?
The girls will not have been singing, will they have been
Sentence patterns for the tense
In positive sentences, we simply make the sentences according to Future Perfect continuous Tense rules as below-
Sub+ will have been+ Verb+ ing+ since/for (time)
I will have been playing cricket with them from three hours.
While making negative sentences, we normally use ‘not’ after auxiliary verb ‘will’ and rest remains same.
Sub+ won’t have been+ Verb+ ing+ since/for (time)
Lisa will not have been improving in studies from next year.
Why+ won’t+ Sub+ have been+ Verb+ ing+ since/for (time)
Why will you have been trying to learn cooking from hours?
1. The tense is used to express any action where ‘by’ with future indication words like ‘next’ and ‘tomorrow’ and ‘since/for’ with another time is given.
By next summer, she will have been staying at the hostel for 2 months.
2. The tense is used when we have to express cause of some future situation.
You will be taking a break because you will have been studying for 3 hours
I will have been cleaning entire evening tomorrow so I will be taking a break today
3. The tense is used to express an action that will be continued until any other even occur
The boys will have been talking to each other before the trainer arrives
He will have been staying in the hotel by the next week