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when (interrogative adverb used to ask about time)
いつ来ますか？
When will you come?
いつ生まれましたか？
When were you born?
Often used in questions to inquire about the time of an event or action.
いつ is often used in questions to ask about time, similar to 'when' in English.
Derived from the Old Japanese interrogative pronoun 'itu' with the same meaning.
Can be used in both formal and informal contexts, but is more commonly used in casual conversation.