Answer keys of degrees of certainty – past time
Use an appropriate form of must, can, and could with the verbs in parentheses to complete the dialogues.
1.A: Abigail fell asleep during the lesson this morning.
B: she (sleep) mustn’t have slept well last night.
2. A: Paul always pushes all onions aside, and never eats them.
B: He (dislike) must dislike onions.
3. A: It was the first time for Addison to deliver a speech in front of her school.
B: She (be) must have been nervous.
4. A: Can you lend me some money?
B: I don’t seem to have my wallet. I (leave) couldn’t/can’t have left it at home because I paid for my taxi.
5. A: Gavin told me that he would to the beach.
B: So, he (swim) must swim/ be swimming in the sea right now.
6. A: Have you seen my hand bag?
B: It (be) could be in the kitchen.
A: It’s not in the kitchen. It (be) must be in my bedroom. I was there a few minutes ago.
B: Have you found it yet? You (leave) could have left it in the toilet.
A: I (leave) can’t/couldn’t have left it in the toilet. I haven’t got in the toilet since I came home.
7. A: I met a nice girl at a party last night. I asked her a question in English, she just smiled and nodded.
B: she (speak) mustn’t have spoken much English.
8. A: These shoes don’t fit me anymore.
B: Your feet (grow) must have grown
9. A: It (be) could be Tom over there.
B: he (be) can’t/couldn’t be Tom. Tom is bigger, and taller than that guy.
A: So, I (have) must have some problems with my eyes.
10. A: I didn’t see Dave yesterday. Where was he?
B: He (go) could go to visit his grandma.
A: He (go) can’t/couldn’t have gone to visit her because she was travelling in a foreign country.
B: He (study) must have studied in the library because he said he needed a quiet place to study for his tests.
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