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when (A1)

adverb, conjunction, noun

Pronunciation: /wɛn/

At what time or occasion.

when did (question structure): Used to ask about a past event. — "When did you buy that car?"
when will (question structure): Used to ask about a future event. — "When will the train arrive?"
when I (conjunction phrase): Referring to a specific time in the speaker's past or future. — "When I was young, I loved to play outside."
since when (question phrase): Asking about the starting point of a situation. — "Since when have you been interested in photography?"