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.
When can be used as an adverb, noun, pronoun, and conjunction.
Here is an adverb.
"Last" is an adjective...
Again is an adverb, which typically serving as a modifier of a verb.
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