/wen/
什么时候（用于询问时间）
at what time; on what occasion
当...的时候
at or during the time that
既然；考虑到
considering that; although
when it comes to
当谈到...时
when possible
尽可能时
hardly... when
刚...就...
When will you arrive?
你什么时候到？
I was watching TV when she called.
她打电话来的时候我正在看电视。
Why do you need a car when you live in the city?
你住在城里，为什么还要车呢？
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