Предложения в прошедшем и будущем времени.
1. He must prove his theory. 2. They may live in our house. 3. She can use my computer.

1 He had to prove his theory. Will he have to prove his theory?2. They might  live in our house.They will be alowed/permitted to live in our house.3. She could/was able to use my computer.Will she be able to use my computer?