When did the school start?

When does the school start?

-- Which of the above looks absolutely correct as per the grammar rules.

  • Neither is really idiomatic because of the article. If you drop the, it will sound a lot better. But even with the article, they are both grammatical. – Jason Bassford Dec 10 '19 at 4:11

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?"


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