Active Voice: The verb is in active voice when the subject performs the action. The focus is on the subject.
Eg. The lion killed the deer.
Passive voice: The verb is in passive voice when the subject receives the action. The focus is on the action.
Eg. The deer was killed by the lion.
HOW TO CHANGE INTO PASSIVE VOICE:
Active: The Lion killed a deer.
(Subject) (verb) (object)
Passive: A deer was killed by the lion.
(the object (The verb is (The subject becomes
is made the made the object)
Here are two videos to help you understand Active and Passive Voice better. Do watch them.
The second video also gives the same definition of Active and Passive Voice but in a different way. You can refer to this as well in case you have any further doubts. This video gives you a cheat to identify both active and passive voice.
RULES TO CHANGE ACTIVE INTO PASSIVE VOICE:
Now try this exercise and see if you can solve it!