Hi, Broadly speaking, when the interrogative pronoun (except for whom ) is the subject of the question, no auxiliary verb is used. In fact, you are questioning the subject. Who bought this for you?
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kook j sometimes encounter the interrogative sentences in which auxiliary verbs, especially did I suppose, are omitted and verbs in past tense are placed immediately after an interrogative. eg.Who told you?What happened to him? Question:Could you let me know if there is any grammatical rule for this usage?When the interrogative words who, what,