A: Are you tired?#
B: What does he want to know?#
C: He wants to know if you are tired.#
A: Why are you tired?#
B: What does he want to know?#
C: He wants to know why you are tired.#
A: Are you reading?#
B: What does he want to know?#
C: He wants to know if you are reading.#
A: What are you reading?#
B: What does he want to know?#
C: He wants to know what you are reading.#
A: Does Tom always do his homework?#
B: What does he want to know?#
C: He wants to know if Tom always does his homework.#
A: When does Tom do his homework?#
B: What does he want to know?#
C: He wants to know when Tom does his homework.&