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主语从句是英语语法中的一个重要概念,它是由一个从属连词引导的从句,作为整个句子的主语。主语从句引导词是指引导主语从句的连词或关系代词。下面是几个常用的主语从句引导词:
1. that
“that”是最常用的主语从句引导词之一。它在句子中可以引导宾语从句、表语从句、宾补从句和主语从句等。例如:
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That he won the first prize is beyond doubt.(他获得了一等奖是毫无疑问的。)
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It is important that we should learn English well.(我们应该好好学英语是很重要的。)
2. whether
“whether”用于引导一个主语从句,表示两种或多种可能性。例如:
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Whether he will come to the party is uncertain.(他是否会来参加聚会还不确定。)
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I don't know whether it will rain tomorrow.(我不知道明天是否会下雨。)
3. who/whom/whose
“who/whom/whose”都可以用来引导主语从句,表示人。例如:
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Who will pay for the meal is still undecided.(谁来付餐费还没定。)
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Whom they will choose as the team leader is not yet known.(他们会选谁作为队长还不确定。)
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Whose book is this?(这是谁的书?)
4. what/whatever
“what/whatever”用于引导主语从句,表示事物。例如:
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What we need now is more time.(我们现在需要的是更多的时间。)
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Whatever you do, don't give up.(不管你做什么,都不要放弃。)
以上是几个常用的主语从句引导词。掌握这些引导词,有助于我们更好地理解和运用主语从句。