Dưới đây là các câu viết lại tương ứng với yêu cầu:

1. The white dress is cheaper than the black one.
2. Maths is more difficult than English, in my opinion.
3. That computer is not as fast as this computer.
4. Andy is slower than Lucy.
5. That film is more interesting than this film.
6. Peter is shorter than no one in my class.
7. The white dress is less expensive than the black one.
8. Mary is more intelligent than no one in my group.
9. The Nile is the longest river in the world.
10. My family hasn't had such a delicious meal before.
11. The last time I saw Jean was ten days ago.
12. Van Anh has been driving for two months.
13. My family started eating when it began to rain.
14. I haven't had my hair cut since he left me.
15. How long have you been working here?
16. Alan hasn't visited his parents for ages.
17. I last saw him when I was a student.
18. She has been working as a secretary for five years.