1. Next semester I will have been
studying English for half a year.
2. The day after tomorrow, I will
have been writing poems for a year.
3. He will have been playing the
violin for an hour by the time I come.
4. For how many years will you have
been working when your son goes to school?
5. For how much time will you have
been studying jurisprudence when you begin to work?
6. By 2020 she will have been
singing jazz for ten years.
7. Tomorrow they will have been
doing reconstruction for two years.