Who told you about the changes in the schedule?, A subject question in the Past Simple. We ask who did the action, so no do/did is used., What did she decide to do after the meeting?, A Wh-question asking about the object in the Past Simple. We use did + base verb., Who were you waiting for when the lesson ended?, A Wh-question in the Past Continuous, asking about the object., Why didn’t they invite him to the conference?, A Wh-question asking about the reason. The auxiliary verb is used., What are they arguing about so loudly in the office?, A Wh-question with a preposition at the end of the sentence., Did he really expect everyone to agree with his idea?, A Yes/No question. The auxiliary verb comes before the subject..

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