"when" 的定义和意义

when

什么时候

used when we want to ask at what time something happens

什么时候

used to refer to a specific situation or time

when

于

used to indicate that two things happen at the same time or during something else

于

used to imply unexpected or ironic outcomes

于

used to provide a reason or explanation for the main clause

when

什么时候

used to represent the time when something happens as the subject or object of verb or preposition

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