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.
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.
That's all about the four forms of tense,,enjoy the lesson and don't forget to do the exercise!
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