PASSIVE VOICE:
Rule: “to be” in the given tense+the past participle of the given verb 
Mohammed eats an apple every day.An apple is eaten by Mohammed every day.She reads a lot of books every month. A lot of books are read every month. Certain verbs need two objects, so we can construct two passive sentences: They give me a report once a week. I am given a report once a week.A report is given to me once a week.: جدول توضيحي لأهم الأفعال محولة إلى المبني للمجهول
Tense/verb form | Active voice | Passive voice |
Simple present Present continuous Simple past Past continuous Present perfect Past perfect Present infinitive Modal auxiliaries | Keep/keeps Is/are keeping Kept Was/were keeping Has/have kept Had kept To keep Modal auxiliary+infinitive Will keep Would keep Should keep etc.. | am/is/are kept Is/are being kept Was/were kept Was/were being kept Has/have been kept Had been kept To be kept Modal auxiliary+be+past participle Will be kept Would be kept Should be kept etc… |
Examples:
We keep the butter here.
The butter is kept here.
They broke the window.
The window was broken.
They broke the windows.
The windows were broken.
People have seen a wolf in the streets.
A wolf has been seen in the streets.
They are repairing the bridge.
The bridge is being repaired.
They had already done their homework.
Their homework had already been done.
They were carrying the injured player off the field.
The injured player was being carried off the field.
You must shut these doors.
These doors must be shut.
He wants someone to take photographs.
He wants photographs to be taken.