To form the Passive Voice in English we need two verbs, an auxiliary verb, in this case BE and a main verb which makes the meaning of the message clear, used in the Past Participle form.
Example: The window IS CLEANED every Sunday.
We notice that the auxiliary BE is conjugated in the Simple Present, so it becomes IS.
The main verb in this example is the verb CLEAN, but we use the Past Participle form, so it becomes CLEANED.
We can form passive sentences in any verb tense. The changes in the tenses are marked by the verb BE. That is to say that it is the auxiliary BE which makes all the changes to express verb tense, but the main verb is always in the Past Participle form.
Example: The window IS CLEANED every Sunday.
The window WAS CLEANED last Sunday.
The window WILL BE CLEANED next Sunday.
The window HAS BEEN CLEANED every Sunday since I remember.
The window IS BEING CLEANED right now because it is Sunday.
Et cetera.
You can find more information about the Passive Voice and practice in this link.
"Wisdom is only found in truth."
(J. W. Goethe)
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