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關閉窗口 (1)當先行詞是指物的all, little, few, much, any, anything, everything, nothing, none, the one時，或先行詞被all, little, few, much, any, every, no等修飾時。
All that can be done has been done. 能做的都已經做了。
He will tell you everything that he heard about it.他將告訴你他所聽到的關于這件事的一切。
There is little work that is fit for you. 沒什么工作適合你做。
I have eaten all the food that is left. 我把剩下的所有食物都吃了。
(2)先行詞是序數詞或最高級形容詞時，或者先行詞被序數詞(包括last, next)、最高級形容詞及the only, the very 等修飾時。
This is the first film that I have seen since I came here.這是我到這里后所看的第一場電影。
This is the best that has been used against pollution. 這是用來防止污染的最好辦法。
This is the very book that I am looking for. 這正是我一直在尋找的那本書。
(3)先行詞包括人和物時(from www.nmet168.com)。
They often talk about the people and the things that they are interested in. 他們常常談論那些他們感興趣的人和事。
(4)當主句是以who或which開頭的疑問句時，為了避免重復，多用that引導。如：
Which is the house that caught fire last night? 昨晚失火的是那座房子？
Who is the lady that is playing the piano? 在彈鋼琴的那位小姐是誰？
(1)在非限制性定語從句中，不以能用that引導。
Yesterday I met Mary, who seemed very excided. 昨天我碰到了瑪麗，她顯得非常興奮。
(2)直接在介詞后作賓語時，不能用that引導，要用whom, whose或which，且不能省略。
The house in which we live is not large. 我們住院的房子不大。
I know the young man with whom you live. 我認識和你住在一起的那個年青人。
但當介詞放在從句的末尾時，可以用that替代which, who替代whom，也可以省略關系代詞。如：
The house (which/that) we live in is not large. 我們住院的房子不大。
I know the man (whom/who/that) you live with. 我認識和你住在一起的那個人。
(3)當先行詞是指人的all, any, few, one(s), anyone, everyone, people 等時，多用 who。如：
None so blind as those who won't see. 睜眼不看事實的人眼最瞎。
Anyone who is over sixteen is allowed in. 任何超過十六歲的人都允許進去。
I met someone who said he knew you. 我碰到一個人，他說認識你。
He who has a mind to beat his dog will easily find his stick. (諺)欲加之罪,何患無辭。
(4)當先行詞與關系代詞之間有較復雜的短語或從句隔開時(from m.52ysedu.com)。
I was the only person in my office who was invited. 我是我們辦公室里唯一受到邀請的人。
A new master will come tomorrow who will teach you German. 有位新校長明天來，他將教你們德語。
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