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when

when

pronunciation:
wen [or] hwen
parts of speech:
adverb, conjunction
part of speech: adverb
definition: at what time.
When will you come?
 
part of speech: conjunction
definition 1: at or during the time that.
He will sleep late when he is on vacation.It is not wise to travel when you are sick.
definition 2: at the moment that.
He smiled when he saw her.