Unit 11: Grammar Explanation and Practice

1. What does "might" express in the sentence: "The keys might be in the kitchen"?

• a) Certainty
• b) Possibility
• c) Obligation
• d) Impossibility

2. In "They could be in the living room," the modal verb "could" expresses:

• a) Certainty
• b) Obligation
• c) Impossibility
• d) Possibility

3. Which sentence expresses strong negative certainty ( = no way!)?

• a) He couldn't have left them in the car.
• b) He can't have left them in the car.
• c) He must have left them in the car.
• d) He might have left them in the car.

4. What is the difference between "can't have" and "couldn't have"?

• a) "Can't have" is more polite.
• b) "Couldn’t have" refers to the past.
• c) "Can't have" is more emphatic about impossibility.
• d) There is no difference.

5. In "He couldn't have left them in the car," what does "couldn't have" suggest?

• a) Past obligation
• b) Present certainty
• c) Past impossibility
• d) Present permission

7. What does "might have" express in "You might have hurt yourself"?

• a) Past obligation
• b) Past permission
• c) Past possibility
• d) Present certainty

8. Which sentence indicates a strong belief about a current state?

• a) You might have hurt yourself.
• b) You must be really happy.
• c) He could be in the living room.
• d) He can't have left them in the car.

9. What is the main difference between "might" and "must" in these examples?

• a) "Might" expresses certainty, while "must" expresses possibility.
• b) "Must" expresses obligation, while "might" expresses permission.
• c) "Might" expresses possibility, while "must" expresses certainty.
• d) There is no difference.

10. In "You must be really happy," what is the speaker's attitude?

• a) They are guessing with low confidence.
• b) They are making a strong assumption.
• c) They are giving advice.
• d) They are denying a possibility.