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1. interrogative adverb "at what time"

ex: when did you last see him?

ex:when would such a rule be justifiable?

2. relative adverb "at or on which" (referring to a time or circumstance)

ex: Saturday is the day when I get my hair done.

3. conjunction "at or during the time that"

ex: I loved math when I was in school.

ex: Call me when you're finished. 4.) preposition, acting as an adverb phrase

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