I.
1. enjoyed
2. Did Nguyen win
3. were
4. did your team score
5. wasn't be
6. Did he go
7. bought
8. stopped
9. played
10. wasn't
II.
1. We finished all the easy levels of Sudoku.
2. She brought a pair of skating shoes
3. He wasn’t a volleyball player.
4. They were strong strikers.
5. Did he join our team?
6. Beckham missed the ball.
7. The folk games were the main activity of the festival.
8. It was not a book about Chinese chess.
9. Karachi taught Judo.
10. The students were very interested in tug of war.
III.
1. Don't stand up!
2. Don't sit down!
3. Don't go ahead.
4. Don't put on your shoes.
5. Don't move!
6. Don't stay with us.
7. Don't keep silent.
8. Don't close the window for me.
9. Don't step on grass.
10. Don't wait here.