Future Perfect Continuous
Future Perfect Continuous has two different forms: "will have been doing " and "be going to have been doing, Future Perfect Continuous forms are usually interchangeable.
FORM Future Perfect Continuous with "Will"
[will have been + present participle]
Examples:
- You will have been waiting for more than two hours when her plane finally arrives.
- Will you have been waiting for more than two hours when her plane finally arrives?
- You will not have been waiting for more than two hours when her plane finally arrives.
FORM Future Perfect Continuous with "Be Going To"
[am/is/are + going to have been + present participle]
Examples:
- You are going to have been waiting for more than two hours when her plane finally arrives.
- Are you going to have been waiting for more than two hours when her plane finally arrives?
- You are not going to have been waiting for more than two hours when her plane finally arrives.
NOTE: It is possible to use either "will" or "be going to" to create the Future Perfect Continuous with little or no difference in meaning.
USE 1 Duration Before Something in the Future
- They will have been talking for over an hour by the time Thomas arrives.
- She is going to have been working at that company for three years when it finally closes.
- James will have been teaching at the university for more than a year by the time he leaves for Asia.
- How long will you have been studying when you graduate?
- We are going to have been driving for over three days straight when we get to Anchorage.
- A: When you finish your English course, will you have been living in New Zealand for over a year?
B: No, I will not have been living here that long.
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