Question

what is the passive voice of "who knocks at the door?"

Answer 1

Answer:

By whom is the door knocked at?

Answer 2

Active Voice :

Who knocks at the door?

Passive Voice :

By whom is the door knocked at ?

Additional Information :

▪️Active Voice refers to a sentence in which the subject is performing the action.

▪️Passive Voice refers to a sentence in which the subject undergoes the action

▪️While changing you have to be aware of the verb form.

▪️In active Voice , the subject is at the initial position but in passive voice , the object is at the initial position

▪️There won't be any change in the tense ! Like , in active voice knocks is in Present Tense and even in Passive Voice is - Present Tense !!