To change an active voice to a passive voice sentence is very easy, you just have to add a "by phrase" on it.

Example: He owns an expensive parker pen (active voice).

This expensive parker pen is owned by him.

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Changing active voice to passive voice depends on the tense of the verb. 

The key phrase is "be + past participle of the verb".  

The passive voice does not always have "by ________ (doer of the action)" in the sentence.  Although to make sure, you may add "by _______(doer of the action).
Example of passive voice without "by ______".
Passive Voice:
    That temple was built in 5th century.  
    (It is not known who specifically built the bridge so the "by____" is

Please click image of student hand-out guide to changing active to passive voice.