關係副詞 where，when 可引導句子成為形容詞子句
which 的兩種用法 (限定/非限定)
限定用法
John has a cat which can sleep all day. (因為約漢擁很多貓，所以要「限定」哪一隻，就是那隻整天都在睡覺)
I don’t know which pen is yours (我不知道那支筆才是你的)
非限定用法 (獨一無二) 人名/地名 也是
John has a cat, which can sleep all day. (因為約漢只有一隻貓，所以不需「限定」哪一隻)
The London team, which played so well last season, has done badly this season. 倫敦除上個賽季打得很好，這一賽季打得卻很糟
Tom was late. That surprised me.
Tom was late, which surprised me.
The elevator is out of order. This is too bad.
The elevator is out of order, which is too bad.
用於大地方的介係詞要用in，用於建築物的介係詞要用at，表示外在或在其上的介係詞要用on。
In which = where (在…裡面)
The university in which he once studied is a famous one.
= The university which he once studied in is a famous one.
= The university where he once studied is a famous one.
他曾經讀 (在裡面讀) 過的大學是一所有名氣的學府
at which = where (在…裡面)
a. That is the restaurant at which I will meet him.
b. That is the restaurant which I will meet him at.
c. That is the restaurant that I will meet him at.
d. That is the restaurant I will meet him at.
e. That is the restaurant where I will meet him.
（那就是我要與他會面的那家餐館。）
On which = when
a. I'll never forget the day which I first met you on. (×)
b. I'll never forget the day on which I first met you. (O)
c. I'll never forget the day when I first met you. (O)
d. I'll never forget the day that I first met you.
e. I'll never forget the day I first met you.
（我永遠不會忘記我初次和你見面的那一天。）
a. July is the month in which the weather is usually the hottest.
b. July is the month when the weather is usually the hottest.
c. July is the month that the weather is usually the hottest.
d. July is the month the weather is usually the hottest.
（七月通常是天氣最熱的月份。）
He's leaving effective immediately.
= He's leaving which is effective immediately.
= He's leaving and it is effective immediately.
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