The cookies were baked by Vera.

The cookies (subject) receives the action of the verb were baked.



The garage was cleaned by Dad. 

The garage (subject) receives the action of the verb was cleaned.



The picture of the ocean was painted by Sandy.

The picture (subject) receives the action of the verb was painted.



The ball was kicked across the yard by the boy.

The ball (subject) receives the action of the verb was kicked.
 
Language Arts:  Active and Passive Voice - Tutorial
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This section will cover how to identify and use active voice and passive voice sentences.

When to Use Active Voice
Lilia sent the letter to Max. 
             (active voice)

The letter that Max received was from Lilia.  (uses more words)
            (passive voice)  
When to Use Passive Voice
The cookies (subject) were baked by Vera.  (passive)

Vera (subject) baked the cookies (object). (active)
Note: Active voice makes sentences more effective and less wordy.
Active voice allows the subject to do the action of the verb in a sentence.
Active Voice
Vera baked the cookies.

Vera (subject) is doing the baking (verb).


Dad cleaned the garage. 

Dad (subject) was doing the cleaning (verb).


Sandy painted the picture of an ocean.

Sandy (subject) was doing the painting (verb).


The boy kicked the ball across the yard.

The boy (subject) was doing the kicking (verb).
Passive Voice
Passive voice allows the subject to receive the action of the verb in a sentence.
Passive voice changes the object of the sentence to the subject. 
Cookies is thing that is acting as a subject, but it is not the thing that is doing the baking.

For this reason, passive voice is not recommended.
Note: Use passive voice when the person or thing doing the action is unknown.
The cupcakes setting on the counter has been eaten.
The sentence above shows that the person who has eaten the cupcakes is unknown.