The future perfect tense
The future perfect tense is used to describe an action that will have been completed at a certain point of time in the future. Consider this situation. You are working on a project and you will finish it in two months. Then at the end of two months, you will have completed that project. Note the form of the verb in used in this tense: will / shall + have + past participle form of the verb.
The future perfect tense is commonly used with a future time expression like by next week, by the end of this year etc.
The train will have left by the time you reach the station. (Here the phrase by the time you reach identifies a certain point of time in the future.)
I will have moved into my new office by the end of this month.
I will have eaten every chocolate in that box before my mom returns from work.
Susan will have finished her studies before she gets married.
Negative forms are made by putting not after will / shall.
I will not have learned my lessons before dad arrives.
We will not have repaired the roof before monsoon sets in.
The question forms are made by putting will / shall before the subject.
Will you have gone to bed before I arrive?
Will they have returned the money before the end of this week?
Future Perfect Continuous Tense
BASICS
The future perfect continuous, also sometimes called the future perfect progressive, is a verb tense that describes actions that will continue up until a point in the future. The future perfect continuous consists of will + have + been + the verb’s present participle (verb root + -ing).
When we describe an action in the future perfect continuous tense, we are projecting ourselves forward in time and looking back at the duration of that activity. The activity will have begun sometime in the past, present, or in the future, and is expected to continue in the future.
In November, I will have been working at my company for three years.
At five o’clock, I will have been waiting for thirty minutes.
When I turn thirty, I will have been playing piano for twenty-one years.
Nonaction Verbs Do Not Use the Future Perfect Continuous
Remember that nonaction verbs like to be, to seem, or to know are not suited to the future perfect continuous tense. Instead, these verbs take the future perfect tense, which is formed with will + have + past participle.
On Thursday, I will have been knowing you for a week.
On Thursday, I will have known you for a week.
I will have been reading forty-five books by Christmas.
I will have read forty-five books by Christmas.
