1. The trees are watered by Nam every morning.

2. Billions of cans are thrown away every year all over the world.

3. The test should be done carefully by the students.

4. Mai will be given a new book by Nam tomorrow.

    A new book will be given by Nam to Mai tomorrow.

5. Used paper and cans are collected by the students for recycling.

6. The difficult exercises can be done by Long very quickly.

7. Glass are broken into pieces.

8. Sugar canes are grown in this area.

9. Every milk bottles can be reused thirty times.

10. Active sentences will be able to change into passive sentences.

1. The trees are watered by Nam every morning.

2. Billions of can are thrown away every year all over the world. 

3. The test should be done carefully by the students.

4. Mai will be given a new book by Nam tomorrow.

A new book will be given Mai by Nam tomorrow.

5. Used paper and cans are collected for recycling by the students.

6. The difficult exercises can be done very quickly by Long.

7. Glass is broken into pieces.

8. Sugar cans are grown in this area.

9. Every milk bottle can be reused thirty times.

10. Active sentences will be able to be changed into passive sentences.