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Past modals of speculation
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Create sentences: Speculate about the past using may, might, could and must.
Free answer
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
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
He ___________(must/make) Mariana mad, because she spanked him.
must have made
I thought I saw Peter today, but it ___________ (couldn't/be) him, because he is in Rome this weekend.
couldn't have been
He _________ (may/miss) the train.
may have missed
She _________ (could not/drive) there. Her car keys are still here.
couldn't have driven
I think I __________ (might/leave) the air conditioner on. Can you check?
might have left
Who told him my secret? It __________ (must/be) Ana, she is a gossip and nobody else knew.
must have been
I'm not sure Sophie forgot the homework, the dog ________ (might/eat) it.
might have eaten
The earthquake ____________ (must/be) terrifying.
must have been
Sophie didn't get hit by a ball. (must not)
Sophie must not have got/gotten hit by a ball.
Sophie didn't eat her snack. (must not)
Sophie must not have eaten her snack.
I lost my friend's book. It's not in my bag. (may)
I may have lost my friend's book. It's not in my bag.
Mario went to the party by himself. (might)
Mario might have gone to the party by himself.
He __________ (could/have/become) a lawyer, but he doesn't like law.
He could have become a lawyer, but he doesn't like law.
They _______ (may/not/be) friendly people.
They may not have been friendly people.
They didn't understand the teacher's explanation. (may not)
They may not have understood the teacher's explanation.
Ellen didn't forget Mary's number. (couldn't)
Ellen couldn't have forgotten Mary's number.
The ending to that movie didn't surprise the fans. (might not)
The ending to that movie might not have surprised the fans.
We saw more than 10 kinds of desserts at the party. (may)
We may have seen more than 10 kinds of desserts at the party.
That strange noise woke up the baby. (must)
That strange noise must have woken up the baby.
Anna was out in the rain. She _________ (must not/bring) her raincoat.
must not have brought
Maria wasn't home last night. She could ____________(be) at her friend's house.
have been
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