Present Deduction
Which modal verbs do we use when we aren't sure about something? (3 answers)
might - may - could
Change the sentence using must: I'm almost certain Mom is the winner.
Mom must be the winner.
Change the sentence by using can't: I am sure it isn't possible that she's the thief.
She can't be the thief.
They are on a trip to England. Their house ____ be empty.
must
Change the sentence by using must: Walt Disney probably won more Oscars than any other entertainer.
Walt Disney must have won more Oscars than any other entertainer.
Change the next sentence by using can't: I'm certain that Mozart wasn't very well-known when he died.
Mozart can't have been very well-known when he died.
Put the words in the correct order: he / suit! / about / so / his / be / embarrassed / must
He must be so embarrassed about his suit!
Change the next sentence by using must: Picasso most likely produced more than 5,000 paintings in his lifetime.
Picasso must have produced more than 5,000 paintings in his lifetime.
Change the next sentence by using can't: US astronauts almost certainly didn't see the Great Wall of China from the moon.
US astronauts can't have seen the Great Wall of China from the moon.
Put the words in the correct order: can't / exam / studied / this / a lot! / be / his / he
This can't be his exam. He studied a lot!
Change the sentence by using must and a phrasal verb: Peggy was at the concert? I guess her parents yielded to her wishes.
Peggy was at the concert? Her parents must have given in.
Change the next sentence by using couldn't: I'm sure you didn't pass the test without studying anything.
You couldn't have passed the test without studying anything.
Correct and combine: They might not be at university. I've seen them at the supermarket.
They can't be at university because I've seen them at the supermarket.
Change the sentence by using must and a phrasal verb: It's very likely Eddie was sharing his personal information with the bank.
Eddie must have been giving out his personal information to the bank.
Change the sentence by using couldn't and a phrasal verb: We're positive she wasn't quitting smoking last time we saw her.
She couldn't have been giving up smoking last time we saw her.