Active and Passive Voice

Do you know about active or passive voice?
Well, today you can learn about active and passive voice structure.

Active voice

Active voice describes a sentence where the subject performs the action stated by the verb.

 

The dog bit the postman
Subject + verb + object.


Passive voice
The passive voice is a grammatical construction. Passive voice is used when the focus is on the action. It is not important or not known, however, who or what is performing the action.

The postman was bitten by the dog.
Object + finite form of "to be"+ past participle + subject 


Examples

Harry ate six shrimp at dinner. (active)
At dinner, six shrimp were eaten by Harry. (passive)

Beautiful giraffes roam the savannah. (active)
The savannah is roamed by beautiful giraffes. (passive)

Sue changed the flat tire. (active)
The flat tire was changed by Sue. (passive)

We are going to watch a movie tonight. (active)
A movie is going to be watched by us tonight. (passive)

I ran the obstacle course in record time. (active)
The obstacle course was run by me in record time. (passive)

These pages are for to practice passive and active voice.
http://www.myenglishpages.com/site_php_files/grammar-exercise-passive.php

http://www.agendaweb.org/verbs/passive-verbs-exercises.html