A. Complete the sentences with must, may/might, can’t/couldn’t:
1. He _ (play) golf now. But I’m not sure.
2. He _ (play) golf now. I’m sure.
3. He _ (play) golf now. I don’t believe it.
4. He _ (play) golf yesterday. But I’m not sure.
5. He _ (play) golf yesterday. I’m sure.
6. He _ (play) golf yesterday. I don’t believe it.

B. Complete the sentences with must, may/might, can’t/couldn’t:
1. She _ (do) archery now. But I’m not sure.
2. She _ (do) archery now. I’m sure.
3. She _ (do) archery now. I don’t believe it.
4. She _ (do) archery yesterday. But I’m not sure.
5. She _ (do) archery yesterday. I’m sure.
6. She _ (do) archery yesterday. I don’t believe it.

C. Complete the sentences with must, may/might, can’t/couldn’t:
1. She _ (do) karate now. I don’t believe it.
2. She _ (go) cycling yesterday. But I’m not sure.
3. He _ (play) cricket now. But I’m not sure.
4. She _ (do) snorkelling yesterday. I’m sure.
5. You _ (do) judo yesterday. I don’t believe it.
6. She _ (play) rugby now. I’m sure.

2. Rewrite the sentences can/could, may/might, must.
Model: It is probably a very interesting book. – It must be a very interesting book. It was probably a very interesting book. It must have been a very interesting book.

1. It is/was probably a very interesting game.
_
2. I’m sure he goes/went in for sports.
_
3. It is possible that they will lose/ have lost the game.
_
4. It is impossible that they will lose/have lost the game.
_
5. I don’t believe that the trainer was satisfied with the results of the game.
_
6. Probably the tall boy is the best boxer.
_
7. Perhaps this fencer will take part in the tournament.
_
8. This golf player didn’t lose the tournament. I don’t believe it.
_
9. I’m sure it is a wonderful stadium.
_
10. Perhaps the task was too difficult for them.

3. Complete the sentences with must or can’t:
1. That man _ a doctor, he’s too young. 2. This _ be Tom’s house. It has a covered porch, two bay windows on the first floor and it’s number is 13, just like he said. 3. Laura _ have much money or she would buy a new car. Her old one is fallen apart. 4. His life _ be easy, he’s unemployed now. 5. Where’s Kate? She _ in the gym, she often goes there at this time. 6. The food is really good at that restaurant. They _ have a great chef. 7. He _ at work now, it’s too late. 8. Marry has got lots of books, she _ really like reading. 9. You’ve eaten a lot. You _ be hungry. 10. There _ something wrong with computer. I can’t switch it on.

4. Complete the sentences with must and must have V3 (past participle)
1. She _ (practice) a lot before she gave a speech. It was wonderful. 2. I can’t find my keys! I _ (leave) them in the office. 3. There is no light in the windows, they _ (already leave). 4. Liza has a lot of flowers, she _ (love) gardening. 5. If they haven’t eaten all day, they _ (be hungry). 6. It _ (rain) a lot. There are puddles everywhere. 7. She has a large library, she _ love books. 8. Tom _ (tell) lies. He is a reliable and honest person. 9. He _ (play) tennis now. I saw him five minutes ago. 10. John _ (swim) in the morning. He was seen in the swimming pool.

5. Complete the sentences with may/might and can’t/couldn’t + have V3 (past participle).
1. He _ (come and visit) you at the weekend. Anyway, I’ll give you a ring. 2. I sent the letter two days ago, so he _ (get) it by now. 3. He is rather late. He _ (miss) the bus. 4. They _ (move) house yet. I saw them in town. 5. I nave a stomachache, I _ (eat) too much last night or I (have) some virus. 6. She was with a man, I didn’t recognize, it _ (be) her brother, but I’m not sure. 7. I _ (join) a sports club in summer, but I haven’t decided yet. 8. I_ (see) him yesterday, but I’m not sure. 9. The aunt _ (come and see) us at the weekend, but I’m not sure. 10. We _ (swim) in the evening, if nothing interferes.