1. The phone is ringing. It ... be Tim.
2. If you are tired, we ... go home now.
3. The weather is very bad now but it ... get better later.
4. You have been driving all day. You ... be very tired.
5. Take an umbrella. It ... rain later in the evening.
6. Simon ... go to hospital yesterday.
7. You look tired. You ... go to bed.
8. You ... do it. I've already done it.
9. I'm so tired I ..... for a month.
10. The story ..... be true, but I don't think it is.