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when

 
pronunciation:
wen [or] hwen
parts of speech:
adverb, conjunction, pronoun, noun
part of speech: adverb
definition 1: at what time.
When will you come?
definition 2: at what point, at what moment, or on what occasion.
When is it all right to interrupt during a meeting?When does your character first enter the stage?At the ballet, when is it okay to go into the theater if you're late?When do people celebrate the most in your country?
 
part of speech: conjunction
definition 1: at or during the time that; on occasion that.
He will sleep late when he is on vacation.
definition 2: every time that; as soon as.
The dog barks when the doorbell rings.
definition 3: at the moment that.
He smiled when he saw her.
definition 4: considering that; if.
It is not wise to travel when you are sick.
 
part of speech: pronoun
definition 1: what time.
Since when have you owned this car?
definition 2: which time.
They left for the store an hour ago, since when we have not spoken to them.
 
part of speech: noun
definition: the time or date of something.
the whens and wheres of the matter