There are two types of verbs; active and passive.
1. We use active verbs if we want to indicate the subject.
Andrew broke the window. (Andrew is the subject and he did the action.)
2. We use passive verbs if we don’t want to indicate the subject.
The window was broken.
We make passive verbs with to be (am, is are etc.) + past participle
Active: Andrew broke the window.
Passive: The window was broken.
The object of the active sentence becomes the subject of the passive sentence.