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根据以上的原则，质问中所提出的，应以（b）译为宜。又如： It is his habit to walk for half an hour before breakfast.（他在吃早饭以前有出去散步半小时的习惯。）为何在 habit 后面又可以接“不定词”呢？通常在 habit 后是要接“介词+动名词”才对，即如 His habit of walking for half an hour before breakfast keeps him healthy.（他在早饭前散步半小时的那种习惯使他保持健康。）确实，在 habit 后应该接用介词加动名词，这原是一般的法则，不过英文写来常有变化，因造句的关系，就不能死守着法则不放，还是要理解文句的构造，才不致为法则所制。 It is his habit to walk for half an hour before breakfast.一句中的不定词 to walk 并不表示那种习惯的动作，从文法上讲，它是一个名词，不是动词，所以与 habit 毫无关系。句中的 It 是填补词，是假主语，真正的主语为 to walk for half an hour before breakfast，因为主语太长，放在动词之前显得尴尬，所以用 it 来代替主语，而把意味上的真正的主语移到后头了。 To walk 既是主语，当然是名词了。这句的意义不是说“散步的习惯”，而是说：“早饭前散步是他的习惯。”至于 His habit of walking for half an hour…，才是指的“散步的习惯”，二者是判然不同的。
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英文疑难详解 106．so as to do 和 so…as to do
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（a） We started so early as to get there before noon.
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（b） We started early so as to get there before noon.
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上面这两句英文在意义上有何不同？
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【解答】（a）可译作“我们很早动身，所以在正午以前就到达那里了”。（b）可译作“我们要在正午以前赶到那里，所以很早就动身了”。这个 so as to 的造句，如果分开是表“结果”之意，如果连在一块儿，就是表“目的”的了。即是（a）与 so——that 相同，而（b）则与 so that——may 相同，所以质问中的例句可以改写如下：
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（a） We started so early as to get there before noon.= We started so early that we got there before noon.
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（b） We started early so as to get there before noon.= We started early，so that we might get there before noon.
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现在再举一两个类似的例子，以资研习：
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1.“他大为生气，连话都说不出来了。”
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He was so angry as to be unable to speak.
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He was so angry that he could not speak.
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2.“早点来可以占到好位子。”
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Come early so as to get a good seat.
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Come early so that you may get a good seat.
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Come early in order to get a good seat.
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3.“她轻移莲步，不使有一点声音。”
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She walked softly so as not to make any noise.
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She walked softly that she might not make any noise.
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She walked softly in order not to make any noise.
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又这个 so as to 还可以代替副词用，如：
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1.“他很好借了那笔钱给我。”
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He was so kind as to lend me the money.
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