Online English grammar exercise (ESL) | Couldn't/Might Not 1

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ONLINE ENGLISH GRAMMAR QUIZ
topic: MODALS (Couldn't/Might Not) | level: Intermediate

Click on Answer to see the correct response.

I'm sorry I _____ come yesterday.
a. could not
b. might not
I'm sorry but I _____ be able to come today.
a. could not
b. might not
I'm sure that _____ have been him.
a. could not
b. might not
I'm not sure, but that _____ have been him.
a. could not
b. might not
Let's check the news. The airport _____ be open.
a. could not
b. might not
I _____ tell him the truth about Holly... but I should have.
a. could not
b. might not
Jeanette had made other plans, so she _____ come with us to the museum yesterday.
a. could not
b. might not
Jeanette has made other plans, so she _____ come with us to the museum today.
a. could not
b. might not
He _____ have possibly won that contest! He was so stupid!
a. could not
b. might not
She _____ have told him. That's why he didn't mention anything to me.
a. could not
b. might not