Grammar question - WHICH and IN WHICH

簡單來說，如果句子裡面需要preposition連接Subject，而你又想用 WHICH 去連接它們，並且不想把該preposition放到後面，你就要將個preposition放在 WHICH 的前面。

例如以下句子：

You can find a lot of information about computer programming IN the book.

可轉成：

This is the book in which you can find a lot of information about computer programming.

至於 WHICH，就是整句句子都沒有preposition在裡面連接Subject，這就是和 IN WHICH 的最大分別。

例如以下句子：

You should take this book to the university.

可轉成：

This is the book which you should take to the university.