1. he used to smoke alot

2. jimmy is the tallest person in the class

3. i spoke more than you did

4. no one in the club plays tennis better than mary

5. Apples are not cheaper than oranges

6. you don't know him as well as me

7. nga's sister is more intelligent than nga

1.He still smokes but he smoked a lot 2 years ago.
-->He used to smoke 2 years ago more than now
2. No one in the class is as tall as Jimmy.
-->Jimmy is the tallest in the class.
3. You didn’t speak more than I did.
-->I spoke more than you did
4. Mary is the best tennis-player in the club.
--> No one in the club is better at tennis than Mary.

5. Apples are not as expensive as oranges.
-->Apples are not more expensive than oranges.
6. I know him better than you do.
-->You do not know them as well as I do. 
7. Nga is not as intelligent as her sister.
-->Nga’s sister is more intelligent than Nga.