Theory:

The voice of a verb tells whether the subject of the sentence performs or receives the action.
Types of Voice:
Active Voice: The subject performs the action expressed by the verb.
Usage: When there is direct relation between verb and subject.
 
Passive Voice: The subject receives the action expressed by the verb.
Usage: When the action is the main thing, not the subject or when the doer of the action is unknown.
Example:
1. Active Voice: Sajid wrote an email.
    (Subject) + (verb) + (object).
    Passive Voice: An email was written by Sajid.
    (Object) + (verb) + (past participle) + (by subject).
 
2. Active Voice: Open the main gate
    Passive Voice: Let the main gate be opened.
    Formation of Passive Voice = Let + Object + be + Past Participle
 
3. Active Voice: I remember my mother taking me to the park.
    Passive Voice: I remember being taken to the park by my mother.
Some Active Voice sentences from the lesson  "The Tsunami":
1. Something hit Alma's grandfather on the head.
2. The waves washed away seventy-seven people.
3. The waves swept Meghna away.
4. People did not find any animal carcasses.
 
Some Passive Voice sentences from the lesson "The Tsunami":
1. Meghna was slept away.
2. Almas's grandfather was hit on the head.
3. Then it was as if the entire sea had come out after them.
4. She was brought to the shore by a wave.