1.She studies English so as to improve her knowledge.

2.I haven’t gone to HCM for 6 years.

3.A visitor asked Lan where the post office was.

4.Would you mind lending me your ruler?

5.It took us five hours to gett to London.

6.I am going to have my piano tune tomorrow.

7.Nam is always forgetting his homework.

8. I was given a very nice watch yesterday.

9.We’d rather you didn't smoke.

10.Toan advised Minh not to believe him.

Answer:

1.She studies English so as she an improve her knowledge.

2. I haven't goes to Ho Chi Minh City last time.

3.A visitor asked Lan:"Are you now where is the post office?".

4.Would you mind a a ruler?

5.It took us 5 hours to London.

6.I am going to playing the piano.

7.Nam is so forgetting,he forgot his homework at home.

8.I was so happy because my mom gave me a very nice watch.

9.We'd rather shouldn't he smoke.

10.Toan advised:Yes,I will.Thanks.