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Rules of Conversion from Active to Passive Voice:

1. Identify the subject, the verb and the object: S+V+O

2. Change the object into subject

3. Put the suitable helping verb or auxiliary verb

4. Change the verb into past participle of the verb

5. Add the preposition "by“

6. Change the subject into object

Conversion of Active and Passive voice examples

 Rita wrote a letter. (Subject + Verb + Object)

 A letter was written by Rita. (Object) + (auxiliary verb) + (past participle) (V3) + (by subject).

 She cooks food. (Subject + Verb + Object)

 The food is cooked by her. (Object) + (auxiliary verb) + (past participle) (V3) + (by subject)