Один нюанс требует разъяснения. Поставьте глаголы из скобок во время Future Continuous или Future Perfect. Не используйте сокращенную форму вспомогательных глаголов.
By the time I finish school I __________ (choose) my future profession.
By the end of this year Mrs. Green __________ (teach) for 20 years.
At 11 o'clock tomorrow Sam __________ (prepare) for an exam in the library.
Phone me after 12 o'clock. I __________ (pass) my entrance exam by then.

By the time I finish school I will have chosen my future profession.

By the end of this year Mrs.

Green will have taught for 20 years.

At 11 o'clock tomorrow Sam will be preparing for an exam in the library.

Phone me after 12 o'clock.

I will have passed my entrance exam by then.