Share Past modals of speculation
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I think I __________ (might/leave) the air conditioner on. Can you check?
might have left
She _________ (could not/drive) there. Her car keys are still here.
couldn't have driven
He _________ (may/miss) the train.
may have missed
I thought I saw Peter today, but it ___________ (couldn't/be) him, because he is in Rome this weekend.
couldn't have been
He ___________(must/make) Mariana mad, because she spanked him.
must have made
Choose the correct option: Where's Mary? Her bag was here and her cellphone too, so she _________ (couldn't have / must have) gone home.
couldn't have
Choose the correct option: I can't remember my password! But I _________ (may have/ must have) written on my notebook as I sometimes do.
may have
Create sentences: Speculate about the past using may, might, could and must.
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