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1. Would you mind if I used your computer?
2. Mai is always leaving her ruler at home.
3. We have known each other since we were students.
4. Tuan asked Nam if he liked playing sports in his free time.
5. I don’t work as hard as my sister.
6. He is thought to win the first prize in the final contest.
7. The exercise is too difficult for her to do.
8. The house (which was) built last year is modern and beautiful.
9. So as not to get lost, he took up a map.
10. Not until the bell rang did they finish the work.