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when
01
什么时候, 何时
used when we want to ask at what time something happens
02
什么时候
used to refer to a specific situation or time
when
01
当...时, 在...的时候
used to indicate that two things happen at the same time or during something else
02
当...时, 在...时
used to imply unexpected or ironic outcomes
03
当...时, 何时
used to provide a reason or explanation for the main clause
when
01
什么时候, 当...时
used to represent the time when something happens as the subject or object of verb or preposition
when
adv
