Present Deduction
Must
Can't
Deduction again
100
Which modal verbs do we use when we aren't sure about something? (3 answers)
might - may - could
100
Change the sentence using must: I'm almost certain Mom is the winner.
Mom must be the winner.
100
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.
100
Paul is behaving in an unusual way, I think he ______ be drinking
might
200
They are on a trip to England. Their house ____ be empty.
must
200
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.
200
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.
200
A: Someone is knocking at the door.
B: It ____ be the pizza delivery man. I ordered a pizza.
could
300
Put the words in the correct order: he / suit! / about / so / his / be / embarrassed / must
He must be so embarrassed about his suit!
300
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.
300
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.
300
Correct or incorrect? My purse isn’t in my pocket. It may is in my bag.
incorrect
400
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!
400
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.
400
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.
400
What’s the best way to complete the sentence?
I can’t remember what Jason does at university. He could study geography or…
he might study geology. 
he may not study geology.
he must study geology.
he might study geology.
500
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.
500
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.
500
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.
500
Which sentence means:
Maybe talking to Ian will help you solve the problem.
Talking to Ian might help.
Talking to Ian must help.
Talking to Ian can’t help.
Talking to Ian might help.