Topic: MODALS (Couldn't/Might Not)

level: Intermediate

Choose whether each sentence requires could not or might not.
Click on Answer to see the correct response.

1. I _____ make my flight to Dallas on time.
a. could not
b. might not

2. I'm sorry, but I _____ be able to come today.
a. could not
b. might not

3. I'm sure that _____ have been him.
a. could not
b. might not

4. I'm not sure, but that _____ have been him.
a. could not
b. might not

5. Let's check the news. The airport _____ be open.
a. could not
b. might not

6. I _____ tell him the truth about Holly, but I should have.
a. could not
b. might not

7. Jeanette had made other plans, so she _____ come with us to the museum yesterday.
a. could not
b. might not

8. Jeanette has made other plans, so she _____ come with us to the museum today.
a. could not
b. might not

9. That incompetent lawyer _____ have possibly won that case!
a. could not
b. might not

10. She _____ have told him. That's why he didn't mention anything to me.
a. could not
b. might not

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