1. I have not got a pen. Could you give me yours?
2. Take the umbrella. It may start raining.
3. He does not know where his hat is. He thinks it can be in the kitchen.
4. The tree blocks the window. You must cut it down.
5. It's too late. I'm afraid we must leave.
6. May I open the window?
7. You must wait until 5 o'clock.
8. He can not write letters.