I'll start by giving some examples.See if it helps.
Somebody
cleans the room every day. (active)
The room
is cleaned every day. (passive)
Somebody
cleaned the room yesterday. (active)
The room
was cleaned yesterday. (passive)
In many situations, there is an
agent(the person or thing who
does something) and a
recipient (the person or thing that something
is done to).
If we want to make the agent the subject, we can usually do this by choosing an active verb form.
If we want to make the recipient the subject, we can usually do this by choosing a passive verb form.
That should be enough to begin with.
