The Future perfect continous is rather specialized abstraction, the future perfect continuous relates to on-going actions in the future over a period of time, often leading up to another action or point in the future.

 

 

The future perfect is formed by the modal auxiliary will or shall, 

 

the present tense of the verb to have,

 

the   past participle    of the verb to be and

 

the     present continous    of a verb.

 

 

 

FORM Future Perfect Continuous with "Will"(Shall)

[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.

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The Future perfect continous has two different forms: "will have been doing " and "be going to have been doing."

 

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

 

When do we use the future perfect continuous tense

 

We use the Future Perfect Continuous to show that something will continue up until a particular event or time in the future. "For five minutes," "for two weeks," and "since Friday" are all durations which can be used with the Future Perfect Continuous.

 

Examples:

• 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.

 

Using the Future Perfect Continuous before another action in the future is a good way to show cause and effect.

 

Examples:

• Jason will be tired when he gets home because he will have been jogging for over an hour.

• Claudia's English will be perfect when she returns to Germany because she is going to have been studying English in the United States for over two years.

 

We use the future perfect continuous tense to talk about a long action before some point in the future.

Examples:

• I will have been working here for ten years next week.

• He will be tired when he arrives. He will have been travelling for 24 hours

 

ADVERB PLACEMENT

The examples below show the placement for grammar adverbs such as: always, only, never, ever, still, just, etc.

 

Examples:

• You will only have been waiting for a few minutes when her plane arrives.

• Will you only have been waiting for a few minutes when her plane arrives?

• You are only going to have been waiting for a few minutes when her plane arrives.

• Are you only going to have been waiting for a few minutes when her plane arrives?