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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
Example
The lights come on automatically when it gets dark.
I always eat breakfast when I wake up in the morning.
I 'll call you when I finish my work.
02
当...时, 在...时
used to imply unexpected or ironic outcomes
Example
He remained calm when everyone else panicked.
He laughed when others expected him to be angry.
She found hope when all seemed lost.
03
当...时, 何时
used to provide a reason or explanation for the main clause
Example
It does n't make sense to spend so much money on a new phone when my current one works perfectly fine.
I do n't see the point of cooking a big meal when we 're the only ones eating.
I do n't understand why we need to rush when we still have plenty of time to finish the project.
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
Example
When you arrive at the meeting is very important.
I remember when we went to Paris.
I do n't know when he 'll arrive.
