The passive voice simplified.

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The passive voice simplified.

Case 1.  The subject is unkown or irrelevant.
Compare these two sentences: 

      Active voice                                           Passive voice 

    He will clean the room.                       The room will be cleaned.
            Subject: He                                             No subject


Case 2.  The subject is known, but in the passive voice it becomes an agent.
Compare these two sentences:

Active voice                                           Passive voice 

     He will clean the room.                       The room will be cleaned by him.
             Subject: He                                             No subject. The agent is “him.”


Note:    Remember to use the preposition “by” before the agent.


GRAMMAR
How to make a sentence in the passive voice:
   
VERB TO   BE (conjugated) + MAIN VERB (Participle)
EXAMPLES:

The house is built. (Verb to be in the Present Simple: is)
The house was built. (Verb to be in the Past Simple: was)
The house will be built. (Verb to be in the Future Simple: will be)
The house would be built. (Verb to be Conditional: would be)

Feel free to come up with your own examples and ask for corrections, or just have fun making your own sentences here! 