When did the school start?
When does the school start?
-- Which of the above looks absolutely correct as per the grammar rules.
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Sign up to join this communityWhen did the school start?
When does the school start?
-- Which of the above looks absolutely correct as per the grammar rules.
Both are good,
The first (when did) means a question about the past, for example: "Two days ago, when did the school start?"
The second (when does) means a question about the present or future, for example: "Tomorrow, when does the school start?"