Verbs tenses active and passive

Tense	Active	Passive
present simple	I write a book.	A book is written.
present continuous	I am writing a book.	A book is being written.
past simple	I wrote a book.	A book was written.
past continuous	I was writing a book.	A book was being written.
present perfect	I have written a book.	A book has been written.
past perfect	I had written a book.	A book had been written.
future simple	I will write a book.	A book will be written.
future	I am going to write a book.	A book is going to be written.
modal	I must write a book.	A book must be written.
modal perfect	I should have written a book.	A book should have been written.