1.

We must plant more and more trees.

2.

We must never pluck the flowers.

3.

We must take care of our environment.

You see your brother plucking flowers from the garden. What will
you do? Ans Accept all relevant responses.

You see that there are only a few trees in your park. What will you do? Ans Accept all relevant responses.

Your friend keeps on tearing papers from his/her notebook. What will you do? Ans Accept all relevant responses.