I am writing a letter- বাক্যটির সঠিক পরিবর্তিত voice হবে-

A A letter is written by me.

B A letter was written by me.

C A letter was being written by me.

D A letter is being written by me.

Correct Answer: Option D

present continuous tense -এর pasive করার নিয়ম- ***subject (active এর object)+am/is/are being + verb এর p.p + by + object (active এর sub).