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when

when

 
pronunciation:
wen [or] hwen
parts of speech:
adverb, conjunction, pronoun
part of speech: adverb
definition 1: at what time.
When will you come?
definition 2: at which time.
When is it all right to clap?
 
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: every time that; as soon as.
The dog barks when the doorbell rings.
definition 3: if; considering that.
How can you say I failed, when you know how hard I tried?
 
part of speech: pronoun
definition 1: what time.
Since when have you owned this car?
definition 2: which time.
Until when will you be home?