Don't add do, does, or did when the question word ( what in this case) is the subject of the sentence. What did Jack say? Jack is the subject.
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austere125rivers"What did happen"?Actually, this is used for emphatic expression (surprise, shock, disbelief).
austere125riversDo you have any grammar books ?See my response to your other post. I'm not in a position to advise anyone on this topic. Sorry.