1. JUAN FRANCISCO OÑA CORDOBA
ACTIVE  PASSSIVE
To move an active sentence to passive:
The object of the active sentence becomes the subject of the
passive.
The main verb by the auxiliary "to be" is replaced at the same
time along the main verb participle.
The subject of the main clause becomes passive complement
agent.
If we mention in prayer the subject performs the action (subject
agent), this will normally preceded by the preposition "by"
Exemple in pasive voice
ACTIVA PASIVA
PRESENT HE READS A BOOK A BOOK IS READ
PRESENT
CONTINUOUS
HE IS READING A BOOK
A BOOK IS BEING
READ
PAST SIMPLE HE READ A BOOK A BOOK WAS READ
PAST
HE WAS READING
A BOOK
CONTINUOUS
A BOOK
WAS BEING READ
PRESENT HE HAS READ A BOOK A BOOK

2. PERFECT HAS BEEN READ
PAST
A BOOK HAD
HE HAD READ A BOOK
PERFECT
BEEN READ
FUTURE
HE WILL READ A BOOK
A BOOK WILL
BE READ
Modal verbs modal verb is added to be more participle of the
verb in active
EXAMPLES
I CAN BE BOUGHT AN APPLE.