1. can't you do better than that ?

=> is that the best you can do?

2. why don't we go shopping this weekend ?

=> shall we go shopping this weekend?

3. I don't want to do anything too energetic today

=> I don't feel like doing anything too energetic today.

4. it isn't necessary for students to wear uniforms on Wednesday

=> students don't have to wear uniforms on Wednesday.

5. she teaches English well

=> she is a good teacher.

6. she feels comfortable to watch TV

=> Watching TV makes her comfortable.

7. my new jeans are more expensive than yours

=> my new jeans aren't as cheap as yours.

8. we spent a whole day looking for these old pictures

=> it took us a whole day to look for these old pictures.

9. when did you buy the coputer ?

=> how long is it since you bought the computer?

10. what is the distance between your hometown and your school ?

=> how far is it from your hometown to school?