Past modals of deduction | Baamboozle - Baamboozle

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Which modal do you use to express impossibility?

shouldn't have

could

couldn't have

musn't

I had to wait 45 minutes for the bus. There .... been an accident or a strike.

couldn't have

might have 

might not have

may not 

I don't see anyone in the office, but I see a computer. She...gone to the restroom

may not have gone

might have gone

may

might

He looks hungry. He ...had breakfast.

could have

may not have

might not have

may have

He...arrived home by now. It's only a 20 minute journey.

could have

should

must have

must

That student got a 100 and he always fails. He ... cheated

must have

may have been

couldn't have

might

He...bought a new car. He has no money!

couldn't have

must have

could have

might have

She .... very happy when she knew that she won the lottery.

must have

may not have been

may have

must have been

My mother is in a terrible mood. Her day....been good.

couldn't have

might have

may not have

must have

She...studied really hard. She passed all her exams with very good grades

must

would have

must have

might have