Why did you tell him(the truth)?有助动词did,而Who told you that?就没有.特殊疑问句什么时候要助动词什么时候不要?

问题描述:

Why did you tell him(the truth)?有助动词did,而Who told you that?就没有.特殊疑问句什么时候要助动词什么时候不要?

疑问词作主语时不用