The passive form of 'I was writing a letter' is :
AA letter was being written by me
BA letter has been written by me
CA letter is written by me
DA letter is being written by me
AA letter was being written by me
BA letter has been written by me
CA letter is written by me
DA letter is being written by me
Related Questions:
Convert the sentence provided below from its passive voice structure to an active voice structure:
It has been alleged that confidential data was being leaked by insiders within the firm.