There can be TWO kinds of interrogatives;

Interrogatives starting with auxiliary verbs or modal operators (do, be-form have, shall, will and their inflectional forms).
Interrogatives starting with relative pronouns or wh– question (who, when, where, how etc).

The method of converting them into passive voice is quite simple. All the changes as explained in introductory chapter are applied with slight awareness of the fact that how to make interrogatives, the way you make interrogatives in tenses.


Active voice: When are you giving us the party?
Passive voice: When the party is being given to us by you?

Active voice: Where had he taken you?
Passive voice: Where you had been taken by him?

Active voice: Are you speaking to me?
Passive voice: Am I being spoken to by you?

It is important to know that the questions starting with who is a different matter and treated distinctly. In order to convert any interrogative sentence with who into passive voice you have to do the following.

Use by whom at the beginning of the sentence.
Use object after by whom.
Use Past Participle form quite like other passive sentences.

Use of Auxiliary

The use of auxiliary has already been explained in introductory chapter, still there is a detailed information as follows;

If sentence is indefinite use auxiliaries of continuous, like;

is, am, or are in present indefinite tense.
was or were in past indefinite tense.
will be or shall be in future indefinite tense.

If sentence is continuous use being after auxiliary, like;

is being, am being, or are being in present continuous tense.
was being, or were being in past continuous tense.

If sentence is perfect use been after auxiliary, like;

have been, or has been in present perfect tense.
had been in past perfect tense.
will have been or shall have been in future perfect tense.


Who knocks at the door? (Present Indefinite tense)
By whom the door is knocked at?

Who wrote this letter? (Past Indefinite tense)
By whom this letter was written?

Who will call him? (Future Indefinite tense)
By whom he will be called?

Who is doing this? (Present Continuous tense)
By whom this is being done?

Who was delivering messages? (Past Continuous tense)
By whom messages were being delivered?

Who will have worn this dress? (Future Perfect tense)
By whom this dress will have been worn?

Who has opened the door? (Present Perfect tense)
By whom the door has been opened?

Who had driven the car? (Past Perfect tense)
By whom the car had been driven?

Who will have served the purpose? (Future Perfect tense)
By whom the purpose will have been served?

Quite similarly you can combine negative with interrogative. Here are some examples.

Examples of who-interrogative combined with negative “not“

Who was not answering this very simple question?
By whom this very simple question was not being answered?

Who hasn’t understood my lecture?
By whom my lecture hasn’t been understood?

Who will not complete the task?
By whom the task will not be completed?

Who didn’t arrange the expenses?
By whom the expenses were not arranged?

Who was not enjoying the school trip?
By whom the school trip was not being enjoyed?