Interrogative Pronouns :
Interrogative Pronouns (who, whom, whose, what, which) take the place of unknown subjects and objects in questions.
Who said that?
Whose is this car?
Which do you prefer, milk or tea?
Which is the office?
Who, what, whose, which etc. are called Interrogative Pronouns when they help ask questions. They are used for asking questions. They contain questions in themselves in the words like DO in interrogative sentence.
Interrogative Pronouns have different forms.
Who did it? (I did it.)
Whose horse is this? (It is my horse.)
Whom do you want? (I want him.)
Who - Nominative case - Masculine / Feminine
Whose - Genitive case - Masculine / Feminine
Whom - Accusative case - Masculine / Feminine
Who, Whose and whom are both for singular and plural.
Which is your book?
Which are your books?
Which of these books is yours?
Which will you give?
Which of you has been responsible for this mistake?
WHICH is used for both persons and things.
WHICH can be singular or plural.
WHICH is used in questions when a choice is to be made.
What : (Pre-determiner, Determiner, Pronoun) - used in questions about an unknown thing or person or kind of thing
What are you doing?
What did you do?
What worries me is how we're going to pay for all this?
What are you? (I am a teacher.)
What is he? (He is an engineer.)
WHAT refers to one's profession here.
What! The Prime Minister is defeated!
What! Who kidnapped the Minister's daughter?
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