27. She had to go to see a doctor.
- have to+Vo: phải làm gì = should+Vo: nên làm gì...
28. Her mother cooks worse than she does.
- bad/badly - worse - the worst: tệ
- good/well - better - the best.
29. Nga learns worse than Hoa and Lan do.
30. Lan is my best friend.
- best friend (noun): bạn thân