Rules of Conversion of Voice

Rules of Conversion of Voice:

1. The place of subject and object will change.
2. Only past participle (3rd form) will be used.
3. The word “by” will be used before subject.
4. Helping verbs will be changed according to the tense.
5. Other words such as “with” or “to” may also be used in place of by depending upon the subject and the verb.

         I know him. 

      He is known to me.