When did it happen?
Meaning: This means you want to know the time of an event. It's like saying, Can you tell me when this thing occurred?
Choice of Words: When is an interrogative adverb used to ask for the time of an event. Did is a past tense form of the verb "to do" used to indicate an action that happened in the past. It is a third person pronoun used to refer to a thing or concept. Happen is a verb used to indicate the occurrence of an event. When you put them together, "When did it happen?" is a question asking for the time of an event.
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