1. Interrogative Pronouns ask questions.
2. The interrogative pronouns are : -- who, whose, whom which and what.
a) Who, whose, and whom refer to person.
Examples : -
Who said so ?
Whose book is this ?
Whom do you love ?
b) Which refers to persons or things
Which of these boys will win the prize ?
Which of these books do you like best ?
c) What refers to lower animals and things.
Q : What have you seen in the mountain?
A : I have seen a tiger.
Q : What did he buy ?
A : He bought a house.
Note -- All interrogative pronouns have the same form for the plural as for the singular
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