Question

C Make the following sentences refer to (a) the past, (b) the
future. Add any necessary “time' expressions.
Example: Can you play tennis?
Answer: (a) Could you play tennis as a child?
(b) Will you be able to play tennis when you are 60?
1 He can stay here for an hour.
2 You can do this exercise quite easily.
3 I can write to him because I have his address.
4 I can't write to him because I haven't got his address.
5 We can't understand him because he speaks English so badly.​

Answer 1

Present, Future,Future,Future,Present,Past.

Hope it will help you.