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The passive voice of the sentence is “ Letters are being written to my friend by me”.
Rule of voice change for present continuous tense:-
Active:- Subject + am/is/are + verb + ing + object.
Passive:- Main object ( in subject form) + am/ is/ are + being + verb ( in past participle form) + preposition (“by” in maximum cases) + subject (in object form) + secondary object ( if any)
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