12. Complete the sentences with can, could, may, might, should or must in the positive or negative.
1. Richard's only three but he can, swim very well.
2. You've had that headache for two days. I think you _________ go to the doctor.
3. I was listening very carefully but I_____ hear what she said.
4. I lived in Germany as a child so I _______ speak German then but I _______ speak it now.
5. I know you like sugar but you _________ eat quite so much - it's bad for you.
6. _________ you close the door, please?
7. We ________ move house next year but we're not sure yet.
8. Passengers ________ smoke when the plane is taking off.
9. I think you ________ play tennis with Sally - she ______ play really well.
10. 'll be at work on Saturday so I'm afraid ________ come to the football match with you
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