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Sunday is holiday, when people do not go to work．星期天是假日，这天人们都不上班。
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关系代词that不能用在非限制性定语从句中。why后也不跟这种从句。
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在非限制性定语从句中，which起很大作用，可以说大部分这类从句都是由它引导的。它引导的从句一般修饰一个名词：
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The current, which is very rapid, makes the river dangerous．水流湍急，使这条河很危险。
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My new car, which I paid several thousand pounds for, is not running well．我的新车花了我好几千英镑，却不太好使。
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有时和介词一起用：
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This morning some port wine came, for which I have to thank you．今天早上送来一些波尔图葡萄酒，为此我得向你道谢。
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There are two (bottles) left, one of which is almost finished and the other of which is not quite．只剩两瓶，一瓶快喝完了，另一瓶没完全喝完。
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He’s written a book, the name of which I’ve forgotten．他写了一本书，书名我忘了。
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which有时在从句中起定语的作用：
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He spoke in Greek, which language I could only follow with difficulty．他讲的是希腊语，这种语言我只能勉强听懂。
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I called him by the wrong name, for which mistake I apologize．我把他名字称呼错了，为此我表示歉意。
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Tom spent four years in college, during which time he learned French．汤姆在大学度过了四年，在此期间他学了法语。
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这类从句有时还代表前面整个句子或句子的一部分：
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This I did at nine o’clock, after which I sat reading the paper．我九点钟干这个，之后我就坐着看报。
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They rely on themselves, which is much better．他们自力更生，这样就好多了。
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He has to work on Sundays, which he doesn’t like．他星期天也得工作，这他是不喜欢的。
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She may be late, in which case we ought to wait for her．她可能晚到，那样我们就要等等她。
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在不少情况下关系代词可以省略。在限制性定语从句中，如果关系代词在从句中作宾语，则常常可以省略掉：
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The man (that) I saw is called Smith．我见到的人叫史密斯。
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The people (who/that) you were talking to are Swedes．你和他们谈话的是瑞典人。
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This is the book (which/that) you wanted．这是你要的书。
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Have you anything (which/that) you want to leave with us？你有什么东西要留在我们这儿吗？
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在某些表示时间、地点、方式的词后，关系代词或副词在口语中有时省略：
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Come and see us any time (that) you’re in town．任何时候进城都来看看我们。
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