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a 引导限制性定语从句
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当主句出现such, as, the same等词时，定语从句往往由as引导，从而构成固定结构。
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Take such measures as the situation calls for.
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按形势所需采取相应对策。
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I am the same person when I’m in the spotlight as I am when I’m alone.
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当我处在聚光灯下时和当自己独处时是同一个人。
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There are as good fish in the sea as ever came out of it.
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海里的好鱼取之不尽。
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b 引导非限制性定语从句
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as引导非限制性定语从句时，从句可以置于先行词之前，而且从句经常修饰整个主句的情况。
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As we have noted, few people are total winners or losers.
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正如我们已经指出的，很少有人大获全胜或彻底失败。
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As Eleanor Roosevelt observed, “No one can hurt you without your consent.”
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正如埃莉诺·罗斯福所说：“不经你的同意，谁也伤害不了你。”
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17.5.3 but 引导定语从句
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but可以作关系代词，相当于“which…not”或“who…not”。
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There is no path but can be traveled.
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没有不能走的路。(相当于There is no path which cannot be traveled.)
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There is no tree but bears some fruit.
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没有不结果的树木。(相当于There is no tree which does not bear any fruit.)
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There is no man but has his fault.
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不存在没有过错的人。(相当于There is no man who does not have his fault.)
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17.6 省略引导词的定语从句
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有些情况下定语从句的引导词可以省略，这些情况主要有：当引导词在从句中作宾语，且引导词之前没有介词时；当定语从句修饰名词reason时，引导词why可以省略；当定语从句修饰名词way，表示做某事的方式时，引导词可以省略。
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17.6.1 当引导词在从句中作宾语，且引导词之前没有介词时，引导词可以省略。
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