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Modals of Possibility and Probability Mixed Examples

1. He left the party early.

a) He must have to work tomorrow. b) He must to have to work tomorrow.

2. He has to be finished with the test by now.

a) He must be finished with the test. b) He might be finished with the test.

3. There is new snow on the ground.

a) It might have snowed last night. b) It must have snowed last night.

4. He didn't finish the exam on time.

a) He might not had studied. b) He might not have studied.

5. She doesn't know if she will cook dinner tonight.

a) She might cook dinner. b) She has to cook dinner.

6. Everyone is smoking outside.

a) You could not be able to smoke in here. b) You must not be able to smoke in here.

7. He looks very tired.

a) He must have stayed up late last night. b) He might had to stay up late last night.

8. Everyone received 100% on the math exam.

a) It must have been easy. b) It could have been easy.

9. That book has her name on it.

a) It has to be hers. b) It might be hers.

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10. Who fixed the chair?

a) It couldn't been Jim. He was at work. b) It couldn't have been Jim. He was at work.

Modals of Possibility and Probability for Past Situations

My friend promised to pick me up at 7:00. It's now 7:25 and I don't see him. He

_________________________________________

a might have forgotten.

b must have forgotten.

c might forget.

d might be forgetting.

The hockey player's injury kept him out of the Stanley Cup Playoffs. He _____________________________________

a must have been disappointing.

b might have been disappointed.

c must have been disappointment.

d must have been disappointed.

Our son promised to clean his room, but it is still messy. He ___________________________________________

a couldn't have cleaned it.

b can't clean it.

c cannot clean it.

d couldn't to have cleaned it.

My plants are dead. I ________________________________________________

a can't have given them enough water.

b couldn't give them enough water.

c can't not have given them enough water.

d must give them more water.

Look! Our car isn't in the driveway! Somebody _________________________________________

a might have stolen it.

b could have stolen it.

c must be stealing it.

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d must have stolen it.

The twins have guilty expressions on their faces. They ________________________________________

a must do something naughty.

b must have done something naughty.

c might do something naughty.

d might have done something naughty.

I don't know why he hasn't called me back. He __________________________________________________

a must have forgotten my number.

b might be forgetting my number.

c might forget my number.

d might have forgotten my number.

My white shirt now has green streaks in it. I ____________________________________________

a must not have not washed it properly.

b can't wash it properly.

c must to wash it properly.

d can't have washed it properly.

Betty said she was hungry, but she didn't eat very much after all. She

_______________________________________________

a couldn't have been hungry.

b couldn't like the food.

c couldn't have liked the food.

d can't like the food.

Paul's class starts at 8:30. It's 8:45 and he's not here yet. He _____________________________________________

a might have missed the bus.

b must have been sick.

c must have missed the bus.

d must be sick.