Question

passive voice of he has writing a letter​

Answer 1

Answer:

A letter has been written by him.

Answer 2

I think you made some mistake in the question. I hope you wanted to write "Passive voice of he has written a letter". If this is the question then the answer will be

A letter has been written by him.

Explanation:

Here, He is the subject, has written is the verb and a letter is the object. So, according to the rule, object will come in the place of the subject, i.e. A letter and Subject will go in the place of the object, i.e. He and it will turn into him, so by him. And as it is present perfect tense so there will be no change in the verb but we have add been. So, the answer is A letter has been written by him.

Hope it will help you. Please mark my answer as the brainliest if it helps you.