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English grammar exercises and tests

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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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