Explain the basic rules for changing active voice into passive form with examples

Present Indefinite Tense:

Change object into subject
Is, Are, Am
3rd form of verb
By
Objective form of subject
Active:        I like mangoes.
Passive:     Mangoes are liked by me.

Present Continuous Tense:

Change subject into object
Is, Are, Am
Being
Third form of verb
Objective from of subject
Active:        He is helping his friend.
Passive:     His friend is being helped by him

Present Perfect Tense:

Change object to subject
Has, have
Been
Third form of verb
By
Objective form of subject
Active:        She has closed the door.
Passive:    The door has been closed by her.

Past Indefinite Tense:

Change subject to object
Was, were
Third form of verb
By
Objective form of subject
Active:        She bought a golden chain for herself.
Passive:     A golden chain for herself was bought by her.

Past Continuous Tense:

Object subject
was, were
Being
Verb
By
Object form of subject.
Active:        Was the dog chasing the cat?
Passive:    Was the cat being chased by the dog?

Past Continuous Tense:

Object Subject
Had Been
Being
Verb
By
Object form of subject
Active:        You had not helped me.
Passive:    I had not been helped by you.

Present Perfect Continuous Tense:

Active:        She has been reading these books since morning.
Passive:    These books have been read by her since morning.

Past Perfect Continuous Tense:

Active:        He had been reading this book since morning.
Passive:    This book had been read by him since morning.

Future Indefinite Tense:

Object subject
Will, shall
Be
Verb
By
Object form of subject
Active:        He will read a book.
Passive:    A book will be read by him.

Future Continuous Tense:

Active:        He will be reading a book.
Passive:    A book will be read by him.

Future Perfect Tense:

Object subject
Will have been, shall have been
Verb
By
Object form of subject
Active:        I shall have left this place.
Passive:    This place will have left by me.

Future Perfect Continuous Tense:

Active:        He will have been reading this book since morning.
Passive:    This book will have been read by him.

IMPERATIVE SENTENCES

Let
Verb
Be
Verb
Active:        Clean this room
Passive:    Let the room be cleaned.

USE OF CAN, COULD, MAY, MIGHT, MUST

Object subject
Can, could, may, might, must
Be
Verb
By
Object form of subject
Active:        I can read your handwriting.
Passive:     Your handwriting can be read by me.