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二、连词的种类
连词有两类：
1）从属连词：引导从句。随着从句作用不同，它们又可分为几类：
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从句种类
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主要从属连词
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时间从句
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when while as before after until till whenever
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条件从句
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if unless supposing provided(ing) suppose
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目的从句
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in order that so that that so lest
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结果从句
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so…that such…that so that so
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原因从句
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because as since
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让步从句
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although though even though(if) while
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方式从句
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as like the way as if as though
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地点从句
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where wherever
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比较从句
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than as
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此外还有 that, whether 等从属连词可引导名词从句，在句中担任主语、宾语等。
2）并列连词：连接两个互不依从的次、短语或分句：
Slow but sure. 要慢而稳。（连接单词）
She’ll be back either this week or next week. 她将在这周或下周回来。（连接短语）
I went and she went also. 我去了，她也去了。（连接分句）
并列连词有下面几类：
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表示意思转折的连词
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but yet however nevertheless
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表示因果关系的连词
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for so therefore hence
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其他并列连词
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and or either…or neither…nor
not only…but also both…and as well as
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