Who and Whom
"Who" asks about a person's identity or role, such as "Who is the main character?" or "Who helped you with the project?" This pronoun focuses on identifying people in various contexts.
"Whom" also asks about people but functions as the object in formal questions. While less common in everyday speech, understanding whom helps with proper grammar usage.
What
"What" asks about things, ideas, or specific information. Examples include "What time does the museum close?" and "What is your favorite animal?" This versatile pronoun helps gather details about objects, concepts, and facts.
Which
"Which" asks for choices between specific options or alternatives. When asking "Which cookie should I choose?" or "Which planet is closest to Earth?" this pronoun helps make selections from known possibilities.
Whose
"Whose" asks about ownership or possession. Questions like "Whose backpack is this?" help identify who owns or controls something. This pronoun connects directly to indefinite pronouns in understanding possession concepts.