Passive Voice.
The passive voice is used when we want to emphasize the action (the verb) and the object of a sentence rather than the subject. This means that the subject is either less important than the action itself or that we do not know who or what the subject is.

We form the passive with the verb to be and the past participle of the main verb.
Remember the passive verb forms:
Forms                 Examples              
Present Simpleam/is/are+V3            The room is cleaned every day.
Present Progressive  am/ is/are being + V3The room is being cleaned now.
Present Perfecthave/has been+ V3The room has just been cleaned.
Past Simplewas/were + V3The room was cleaned yesterday.
Past Progressivewas/were being + V3The room was being cleaned when the director arrived.
Past Perfecthad been + V3The room had been cleaned by 4 pm.
Future Simplewill be V3The room will be cleaned tomorrow.
Future Perfectwill have been V3The room will have been cleaned  by 7am tomorrow.