1. The apples on the table are too green for you to eat.
2. Tom is intelligent enough to answer all the questions easily.
3. Their exercise is being done in their class (by my students).
4. Would you mind if I turned the light on? 
5. Do you mind turning the lights on?
6. I used to live in Nha Trang, I often went swimming with my friends.
7. Do you mind if I turn the conditioner on? 
8. They haven't seen her since 2019.
9. A new pen has just been bought.
10. We revise the lesson regularly so as to understandthem more clearly.

1) The apples on the table are green. You can't eat them. 
=> The apples on the table are too green for you to eat.

2) Tom is intelligent. He can answer all the questions easily.
=> Tom is intelligent enough to answer all the questions easily.

3) My students are doing their exercise in their class.

=> Their exercise is being done by my students in their class.

4) Would you mind if I turned.

5) Do you mind turning.

6) When I lived in Nha Trang, I often went swimming with my friends.
=> I used to live in Nha Trang, I often went swimming with my friends.

7) Do you mind if I turn.

8) They last saw her in 2019.
=> They haven't seen her since 2019.

9) I have just bought a new pen.
=> A new pen has just been bought.

10) We revise the lesson regularly because we want to understand them more clearly.
=> We revise the lesson regularly so as to understand them more clearly.