where= in/on/at which ; 修飾表地方的名詞
when= in/on/at which; 修飾表時間的名詞
why= for which; 修飾表原因的名詞
how= in which; how 和 the way 只能用其中之一
where when why how 所修飾的名詞若置於be 動詞之後做補語,該名詞可省略
This is the place where he was born.
=This is where he was born.
That is the day when he'll come.
=That is when he'll come.
That is the reason why he left.
=That is why he left.
That is the way he did it.
=That is how he did it.
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