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同位语从句
同位从句一般跟在某些名词如answer(答案)，hope(希望)，fact(事实)，belief (信仰)，news(消息)，idea(主意；观念)，promise(承诺)，information(信息)，conclusion(结论)，order(命令)， suggestion(建议)，problem(问题)，thought (想法)等后面。例如：
He always works hard even if he knows the fact that he is
not in good health.
I had no idea that you were here.
She told us her hope that she would become a pianist.
He made a promise that he would never come late.
注意：
that 既可引导同位语从句又可引导定语从句，其区别在于：同位语从句由连接词that引导，连接词that本身无意义，在同位语从句中不充当任何成分，不可省略，不可以用其他词替代；定语从句由关系代词that引导，关系代词that在从句中充当一定的成分，作宾语时可省略，由when, why, where引导的 同位语从句和定语从句的区别在于：
同位语从句由连接副词只起连接作用，没有指代作用； 定语从句由关系副词引导，关系副词具有指代先行词的作用，常用一个介词加关系代词替换。
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