There are two special forms for verbs called voice:
1. Active voice
2. Passive voice
The active voice is the "normal" voice. This is the voice that we use most of the time. You are probably already familiar with the active voice. In the active voice, the subject is the doer of the action of the verb:
active subject verb object
Cats eat fish.
The passive voice is less usual. In the passive voice, the subject receives the action of the verb:
passive subject verb object
Fish are eaten by cats.
The object of the active verb becomes the subject of the passive verb:
Subject Verb Object
Active Everybody drinks water.
Passive Water is drunk by everybody.