Which 同 in which 有咩唔同,如何應用?

你已經掌握到which的用法，所以不談。你在用which時是說前句最後那樣東西，所以你那句的後半是說因為swimming is dangerous。但是in which的用法簡單而言是講前句全句意思，所以如果寫I hate swimming, in which...一般要在第一句完結時加逗號，所以in which有點似作「因此」解，表示I hate swimming的原因或後果。

I hate swimming, in which causes me to dislike summer also.
當然這句特別作出來並不太順。尤如說： I hate swimming. It causes me to ...

希望對你對分辨有點作用

I hate swimming, in which causes me to dislike summer also.
???


why not I hate swimming, which causes me to dislike summer also.


is the preposition in necessary? i have never seen before. is it wrong?

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in which - where
School is the place in which students fight.
I hate swimming in which is dangerous X

I hate swimming. Swimming is dangerous.
So you can write: I hate swimming which is dangerous.
The word (which) refers to swimming.

Peter went to Wanchai. I live in Wanchai.
So I can write: Peter went to Wanchai in which I live.
The word (which) refers to Wanchai. Because I live IN Wanchai, so I put the word (in) before (which).

If you write: Peter went to Wanchai which I live.
Then the separate sentences will become: Peter went to Wanchai. I live Wanchai. The second sentence is grammatically incorrect.

For the same reason, you cannot write: I hate swimming in which is dangerous. If you do that, the separate setences become: I hate swimming. Swimming is dangerous in. The second sentence is incorrect.