by which time during which time since when from where的详细用法、以

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by which time during which time since when from where的详细用法、以及和其他相似的词组区分

（1）by which time 引导定语从句,表示“到那个时候为止”.
（2）during which time引导定语从句,表示“在那期间“.
（3）since when引导时间状语从句.（when在这里作介词.注意了,when作介词时只有两种用法,就是since when和until when.）如：
Until when can you saty?你可以待到什么时候?
Since when have you got a new job?你从什么时候开始有了一份新工作?
（4）from where引导定语从句.可以换成from which.有人说from where似乎接的是大概的地点,from which接的是具体的地点.
不明白的再问哟,请及时采纳,多谢!

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