Formation
Formation of Future Perfect tense with Will
Will have + past participle
Examples:
You will have perfected your English by the time you come back from the U.S.- Will you have perfected your English by the time you come back from the U.S.?
- You will not have perfected your English by the time you come back from the U.S.
Formation of Future Perfect tense with Be Going To
Am / Is / Are + going to have + past participle
Examples:
- You are going to have perfected your English by the time you come back from the U.S.
- Are you going to have perfected your English by the time you come back from the U.S.?
- You are not going to have perfected your English by the time you come back from the U.S.
It is possible to use Will or Be Going To for creating Future Perfect with little or no difference in meaning.
Usage
Action in the future before another action
Future Perfect tense in English expresses the idea that something will happen in the future before another action in the future. It can also express that something will happen before a specific moment in the future.
For example:
- By next November, I will have received my promotion.
- By the time he gets home, she is going to have cleaned the entire house.
- I am not going to have finished this test by 3 o'clock.
- Will she have learned enough Chinese to communicate before she moves to Beijing?
- Sam is probably going to have completed the proposal by the time he leaves this afternoon.
- By the time I finish this course, I will have taken ten tests.
- How many countries are you going to have visited by the time you turn 50?
Continuous action in the future before another action
We use Future Perfect tense in English in combination with Non-Continuous Verbs and some non-continuous Mixed Verbs to express a future action that will continue until another action.
For example:
- I will have been in London for six months by the time I leave.
- By Monday, Susan is going to have had my book for a week.
Sometimes the words live, work, teach and study are used in the ways described above, even though they are NOT Non-Continuous Verbs.
Future Perfect cannot be used in sentences starting with time expressions, such as when, while, before, after, by the time, as soon as, if, unless, etc. Instead of Future Perfect in these cases, Present Perfect is used.
For example:
- I am going to see a movie when I will have finished my homework. Not Correct
- I am going to see a movie when I have finished my homework. Correct
Adverbs
- You will only have learned a few words.
- Will you only have learned a few words?
- You are only going to have learned a few words.
- Are you only going to have learned a few words?
Active and Passive Voice
- They will have completed the project before the deadline. Active
- The project will have been completed before the deadline. Passive
- They are going to have completed the project before the deadline. Active
- The project is going to have been completed before the deadline. Passive
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