IV. Rewrite the sentences, using the words in brackets: 1. I'm sure it's a crocodile (must).
2. It's possible you have left your bag in the car (could).
3. I'm sure Mike didn't do it (can't).
4. She speaks foreign languges so well. Perhaps, she travels a lot (mihgt).
5. You have been working all the day. I think you are tired (must).
6. The puppy looks so helpless. I think he has lost his family (could).