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主语从句
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在复合句中做主语，相当于名词，一般置谓语之前，也可用it作形式主语，主语从句放主句之后
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that, whether, if, as if, as though, who, whose, which, how, when, where, why, what, whatever, whoever, wherever
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Whether he will come or not doesn’t matter much.
Whoever comes here will be welcome.
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同位语从句
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放在名词之后(news, problem, idea, suggestion, advice, thought, hope, fact等) 表明其具体内容
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You have no idea how worried we are.
The fact that he lied again greatly surprised us.
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