They got out of the car in a rush. Something __________ (go) wrong. They wouldn't have done so otherwise.
must have gone
Who told him my secret? It __________ (must/be) Ana, she is a gossip and nobody else knew.
must have been
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.
Donna's baby sister cried all night. I don't really know what was wrong, but an insect __________ (bit) her.
might have bitten
They didn't understand the teacher's explanation. (may not)
They may not have understood the teacher's explanation.
She _________ (could not/drive) there. Her car keys are still here.
couldn't have driven
Sophie didn't get hit by a ball. (must not)
Sophie must not have got/gotten hit by a ball.
The earthquake ____________ (must/be) terrifying.
must have been
Mario went to the party by himself. (might)
Mario might have gone to the party by himself.
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
They _______ (may/not/be) friendly people.
They may not have been friendly people.
Create sentences: Speculate about the past using may, might, could and must.
Free answer
He __________ (could/have/become) a lawyer, but he doesn't like law.
He could have become a lawyer, but he doesn't like law.
That strange noise woke up the baby. (must)
That strange noise must have woken up the baby.
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
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.
Jack: Where's Mum?
John: I don't know, but her car's not here, so she __________ (go) out. I don't really know where she went though. She __________ (go) shopping.
must have gone - might have gone
I'm not sure Sophie forgot the homework, the dog ________ (might/eat) it.
might have eaten
Jane's ankle was swollen. She __________ (sprain) it. There's also a slim chance that she __________ (break) it.
may have sprained - might have broken
The female excavator was rather pale when she got out of the cave. She __________ (got) scared by something she saw in there.
must have got(ten)
Anna was out in the rain. She _________ (must not/bring) her raincoat.
must not have brought
I thought I heard something crawling under the sofa last night. I couldn't be sure at that time, but it __________ (be) an insect of some kind.
could have been / might have been
I can't find my car keys. I __________ (leave) them in my other bag, or perhaps I just forgot to take them from Jim.
might have left
They cancelled their hiking plans. They__________ (read) about that bear who escaped from the central zoo.
could have read / might have read / must have read
They took her to the hospital immediately. The spider __________ (be) poisonous.
must have been
I think I __________ (might/leave) the air conditioner on. Can you check?
might have left
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
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.
He _________ (may/miss) the train.
may have missed
Sophie didn't eat her snack. (must not)
Sophie must not have eaten her snack.
Jonas thinks that bees are not beneficial to people. He __________ (read) the wrong information because bees are known to be very beneficial to the entire world.
must have read
I don't know why she decided to have a change of career, but I have a strong feeling that she __________ (decide) she'd make more money as a vet.
may have decided
Maria wasn't home last night. She could ____________(be) at her friend's house.
have been
There was a horrid smell coming from the thrash bin. They __________ (forget) to collect it.
must have forgotten
He refuses to go in the water. He __________ (see) a jellyfish.
might have seen
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