Unlocking modal mysteries a 15 question linguistic labyrinth

1. I ____ drive a car; I haven't got a license.

2. You ____ smoke in here; it's a no-smoking area.

3. Which sentence correctly uses a modal verb to express permission?

4. He ____ be tired; he's been working all day.

5. She ____ go to the doctor; she's feeling unwell.

6. Which sentence correctly expresses a polite request?

7. We ____ have finished our work by tomorrow.

8. They ____ be at home; their car is in the driveway.

9. I ____ go to the party; I'm not feeling well.

10. Which sentence correctly uses a modal verb to express necessity?

11. He ____ have forgotten his keys; he's trying to get in.

12. You ____ worry so much; everything will be alright.

13. We ____ have booked the tickets earlier.

14. She ____ have studied harder for the exam.

15. Which sentence correctly expresses ability in the past?