Exercise 3: Fill in the blanks with "must/ might/ can't" 1. Your mother__________be a great cook. You are always so keen to get back home to eat! 2. I don't know why I am so tired these days. I______________be working too hard. Or maybe I am not sleeping too well. 3. Do you know where Mike is? He__________be out - his car keys are on the table. 4. You seem to know everything about the theatre. You__________go every week. 5. To give the promotion to David was silly. He__________ know much about this company after only a year working here. 6. Go and look in the kitchen for your gloves. They__________be in there. 7. Oh, the phone is ringing. Answer it. It__________be Lisa. She always rings at this time. 8. Bob has been drinking that whiskey since early this afternoon. He_______be totally drunk by now. 9. That couple__________think much of this film. They're leaving already - after only 20 minutes! 10. That's the second new car they have bought this year. They__________be very rich! Exercise 4 : Use "could (n't) have/ should(n't) have/ must(n't) have" to complete the sentence. 1. Your house looks very nice. You__________spent a lot of time painting it. 2. John went running in the rain. He__________gotten sick. 3. It was so dark that he fell down the stairs. He__________fixed the light. 4. Daisy__________gone by bus. Why did she walk? 5. I called him but nobody answered. He__________gone out. 6. You__________cleaned the floor. It looks so clean. 7. Nam__________stolen the car. He was with me all the time. 8. My bicycle is broken. I__________ridden it down the stairs. 9. Tom looks happy. I think he__________gotten a new job. 10. The chocolate cake is all gone! Someone__________eaten it.