We should plant many trees on the mountain.

We should plant many trees on the mountain.

Many trees should be planted on the mountain.

Many trees should be planted on the mountain.

Teenagers should be allowed to go out with their friends.

Teenagers and friends should be allowed to go out.

Children should be allowed to go to the movies with friends on Friday nights.

Children should be allowed to go to the movies with friends on Friday nights.

Tables can be made of stone.

This table can be made of stone.

Waste paper shouldn't be thrown here.

Waste paper shouldn't be thrown here.

Should it be done by Li Ming?

What should Li Ming do about this?