老師說 定語從句中地點狀語in which =where 我想知道是怎么轉化過來的 首先說說我的猜想
老師說 定語從句中地點狀語in which =where
猜想：I‘ll never forget the day on which I joined the club 中on which是不是這么得出來的呢：∵on the day ∴on which也就是說which前的介詞以先行詞前所需加的介詞決定嗎?這結論對嗎 那么 這 里 的 on which 等于when
句子1 Don't forget the day when you were received into the Youth League中的when 是不是也能用on which代替呀?
句子2；Do you know the reason why she has changed her mind?這里why又等于什么了呢?A why B which C for that D of which
C項 的for that 等于reason嗎（因為 the reason for 可為什么要用that 了呢?難道where =in which 的which 也可以換成that么?）