When the subject of a sentence performs action in verb is the?

When the subject of a sentence performs the action in the verb, it is in the active voice.

Here's an example:

* Active voice: The dog chased the ball.

* Subject: The dog

* Verb: chased

* The dog is performing the action of chasing.

In contrast, the passive voice occurs when the subject is acted upon:

* Passive voice: The ball was chased by the dog.

* Subject: The ball

* Verb: was chased

* The ball is being acted upon, not performing the action.