Question

change the voice- the book was written by me

Answer 1

I wrote the book.


HOPE THIS HELPS.

Answer 2

Hola

This sentence is in Passive voice.

As in passive voice

the sentence has object first then the verb and lastly the subject.

Here is the active voice

However in Active voice

first subject then verb and then object.

so,

Answer -- I wrote a book

Hope it helps !