Question

Trees should be planted( change the voice)​

Answer 1

The given sentence is already passive. It can be converted into active as shown and explained below:

This is a subject implied case. A subject implied sentence in active-passive voice is a sentence that is passive but the subject is missing. While converting it into active we have to provide the subject from our side. This sentence is already passive. So we will provide the subject ‘Everyone’ from our side. Hence the active voice of the given sentence will be as given below:  

Everyone should plant trees.

Answer 2

Answer:

trees should be planted