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.
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I suggest using Google Translate: https://translate.google.com.
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