that和which在從句裡都可以做賓語和主語，做賓語時可以省略。
下面來分別看看只能用that 和 只能用 which的情況：
只能用that的幾種情況：
1.不定代詞，如anything, nothing, the one, all, much, few, any, little等作先行詞
There is nothing that I can do.
I mean the one that was bought yesterday.
2.先行詞有the only, the very, the same, the last修飾
This is the very book that I want to find.
The last place that I visited was the hospital.
3.先行詞為序數詞、數詞、形容詞最高階時
This is the first composition that he has written in English.
4.先行詞既有人，又有物時
He talked about the teachers and schools that he had visited.
只用which的情況
which能引導非限制性定語從句，that則不行。
以一道題來感受一下。
Language is a city, ____ to the building of every human being brought a stone.
A.Which B. that C. it D. this
答案：選A
翻譯：語言就像一座城市，對它的建築每個人都曾添磚加瓦。
分析：根據句子結構分析，本題缺少的是一個引導定語從句的關係詞，首先排除C、D 兩項；由於題目中定語從句是非限定性的，所以不能用that。
2.介詞後用which
This is the room in which I was born.
注：介詞+which =where
最後來一道測試題，感受一下定語從句與同位語從句的區別，以及出題老師是如何給定於從句學得好的同學挖坑的。
There"s a feeling in me, ____ we"ll never know what a UFO is ----not ever.
A. that B. which C. of which D. what
答案：A
分析：同位語從句 that we"ll never know what a UFO is----not ever作a feeling 的同位語，解釋a feeling的具體內容。
翻譯：我有這樣一種感覺，我們永遠不會知道什麼是不明飛行物——永遠不會。
注：在 fact 、truth、feeling 等詞後面經常跟同位語從句，有機會詳細講解。
that和which在從句裡都可以做賓語和主語，做賓語時可以省略。
下面來分別看看只能用that 和 只能用 which的情況：
只能用that的幾種情況：
1.不定代詞，如anything, nothing, the one, all, much, few, any, little等作先行詞
There is nothing that I can do.
I mean the one that was bought yesterday.
2.先行詞有the only, the very, the same, the last修飾
This is the very book that I want to find.
The last place that I visited was the hospital.
3.先行詞為序數詞、數詞、形容詞最高階時
This is the first composition that he has written in English.
4.先行詞既有人，又有物時
He talked about the teachers and schools that he had visited.
只用which的情況
which能引導非限制性定語從句，that則不行。
以一道題來感受一下。
Language is a city, ____ to the building of every human being brought a stone.
A.Which B. that C. it D. this
答案：選A
翻譯：語言就像一座城市，對它的建築每個人都曾添磚加瓦。
分析：根據句子結構分析，本題缺少的是一個引導定語從句的關係詞，首先排除C、D 兩項；由於題目中定語從句是非限定性的，所以不能用that。
2.介詞後用which
This is the room in which I was born.
注：介詞+which =where
最後來一道測試題，感受一下定語從句與同位語從句的區別，以及出題老師是如何給定於從句學得好的同學挖坑的。
There"s a feeling in me, ____ we"ll never know what a UFO is ----not ever.
A. that B. which C. of which D. what
答案：A
分析：同位語從句 that we"ll never know what a UFO is----not ever作a feeling 的同位語，解釋a feeling的具體內容。
翻譯：我有這樣一種感覺，我們永遠不會知道什麼是不明飛行物——永遠不會。
注：在 fact 、truth、feeling 等詞後面經常跟同位語從句，有機會詳細講解。