B) fill in the blanks using must, can’t, may, might, could and past forms of them: 1.sally looks sad and worried. she (have) a problem with something.2.bob (be) at school because i haven’t seen him today. 3.mr. treves hasn’t come to work yet. he has never been late for work. he (miss) the bus. 4.timmy is a very good boy. he isn’t naughty, so he (break) that window. someone else (break) it. 5.i’m sure that i dropped my key in the car. it )there at the moment.6.the street is wet this morning. i’m not sure but it (rain) last night.7.a: i talked to your science teacher at school yesterday.b: you (talk) to her because she wasn’t at school yesterday.8.a: the man was being taken to hospital. he (have) an accident.b: yes, i’m sure he had an accident.
9.a: will you come to my birthday party tomorrow? b: i (come) to your party because i have to look after my little sister.10.a: i’m going to do a parachute jump next week. b: you are going to jump out of an aeroplane! but you’re 73 years old! you (be) serious. you (be) mad. a: it really (be) wonderful looking down on everything. i’ve always wanted to try it.b: but anything could happen. you (be) injured, or even killed. i wouldn’t take the risk. a: well, your life (be) much fun if you never take risks. you ought to try it, too. you never know. you (enjoy) it.b: enjoy it! you (be) joking.11.she knew everything about our plans. she (listen) to our conversation. 12.he (eat) the roasted beef when we were out. he is a vegeterian.13.mrs. white bought a new fur coat! she )a lottery.14.john said he would ring, but he hasn’t. he (forget)all about it.15.the children (study) in the library now because they have a test tomorrow.16.the singer has got a sore throath, so she (sing)at the concert.17.i (be) at home this evening, or i (be) out, i’m not sure. 18.he drank three glasses of water. he (be) very thirsty.19.a: where’s the cat? b: it (go) out, the door is closed. 20.the police arrested him right away. they (find)enough evidence. 21.he had no money, so he (lend) you some.22.we can’t wait any longer. something (do) immediately.23.they all shouted in fear. they (be) very afraid.24.a: your dog bit me as i was standing in the hall.b: it (be) my dog. it was with me all day.25.a: i phoned you at 9 o’clock this morning and got no answer.b: i (be) in the garden. i planted some flowers this morning. 26.my grandmother always has a rest at this time of the day, so she (take) a nap now.27.mrs. green wasn’t good at ice-skating, but she insisted on and broke her leg. she (give) up doing that.28.a: i’m afraid ted is watching tv again.b: he (watch) tv, because his room is completely silent and dark. he (sleep).29.that carpet was made by hand. it (take) a long time to make it.

1. Sally looks sad and worried. She may have a problem with something. (Possibility) 2. Bob can't be at school because I haven't seen him today. (Impossibility) 3. Mr. Treves hasn't come to work yet. He may have missed the bus. (Possibility) 4. Timmy is a very good boy. He couldn't have broken that window. Someone else might have broken it. (Impossibility and possibility) 5. I'm sure that I dropped my key in the car. It must be there at the moment. (Certainty) 6. The street is wet this morning. I'm not sure, but it might have rained last night. (Possibility) 7. A: I talked to your science teacher at school yesterday. B: You couldn't have talked to her because she wasn't at school yesterday. (Impossibility) 8. A: The man was being taken to the hospital. He must have had an accident. B: Yes, I'm sure he had an accident. (Certainty) 9. A: Will you come to my birthday party tomorrow? B: I can't come to your party because I have to look after my little sister. (Impossibility) 10. A: I'm going to do a parachute jump next week. B: You are going to jump out of an aeroplane! But you're 73 years old! You can't be serious. You must be mad. A: It really could be wonderful looking down on everything. I've always wanted to try it. B: But anything could happen. You could be injured or even killed. I wouldn't take the risk. A: Well, your life wouldn't be much fun if you never take risks. You ought to try it, too. You never know. You might enjoy it. B: Enjoy it! You must be joking. (Certainty, Impossibility, Possibility) 11. She knew everything about our plans. She might have listened to our conversation. (Possibility) 12. He can't have eaten the roasted beef when we were out. He is a vegetarian. (Impossibility) 13. Mrs. White bought a new fur coat! She must have won a lottery. (Certainty) 14. John said he would ring, but he hasn't. He must have forgotten all about it. (Certainty) 15. The children may be studying in the library now because they have a test tomorrow. (Possibility) 16. The singer has got a sore throat, so she can't sing at the concert. (Impossibility) 17. I might be at home this evening, or I could be out. I'm not sure. (Possibility) 18. He drank three glasses of water. He must have been very thirsty. (Certainty) 19. A: Where's the cat? B: It couldn't have gone out, the door is closed. (Impossibility) 20. The police arrested him right away. They must have found enough evidence. (Certainty) 21. He had no money, so he might have lent you some. (Possibility) 22. We can't wait any longer. Something must be done immediately. (Certainty) 23. They all shouted in fear. They must have been very afraid. (Certainty) 24. A: Your dog bit me as I was standing in the hall. B: It couldn't have been my dog. It was with me all day. (Impossibility) 25. A: I phoned you at 9 o'clock this morning and got no answer. B: I was in the garden. I must have been planting some flowers this morning. (Certainty) 26. My grandmother always has a rest at this time of the day, so she must be taking a nap now. (Certainty) 27. Mrs. Green wasn't good at ice-skating, but she insisted on and broke her leg. She should give up doing that. (Recommendation) 28. A: I'm afraid Ted is watching TV again. B: He can't be watching TV because his room is completely silent and dark. He must be sleeping. (Impossibility, Certainty) 29. That carpet was made by hand. It must have taken a long time to make it. (Certainty)