9. Nam drives carefully, but his sister drives more carefully. (as...as)

  → Nam doesn't drive as carefully as his sister does.

10. We left the meeting at 10 pm; they left the meeting at 10 pm too. (the same...as)

  → We left the meeting at the same time as they.

11. I am tall, but you are taller. (as..........as) 

  → I am not as tall as you.

12. My bicycle is nice but yours is nicer. (as...as)

  → My bicycle isn't as nice as yours.

13. Lan is pretty, and her sister is pretty too. (as.. .as)

  → Lan is as pretty as her sister.

14. Cats aren't friendly, but dogs are friendly. (different from)

  → Cats are different from dogs.

15. Mr. Brown is 50 years old; Mrs. Brown is 50 years old. (the same)

  → Mr. Brown is the same age as Mrs. Brown.

16. He has a harsh voice, but his sister has a sweet voice. (different from)

  → His voice's different from his sister's voice.

=>
9. Nam doesn't drive as carefully as his sister.
10. We left the meeting the same time as they did.
11. I am not as tall as you.
12. My bicycle is not as nice as yours.
13. Lan is as pretty as her sister.
14. Cats are different from dogs.
15. Mr.Brown is the same age as Mrs.Brown.
16. His voice's different from his sister's voice.