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在复合句中充当同位语。 1. that引导同位语从句。 在下列名词后可用that引导同位语从句answer, belief,doubt, fact, hope, idea, information, knowledge, law, news, opinion, plan, suggestion, thought, truth等。 I had no idea that you were here. The story goes that william killed his wife. 注意 ①同位语从句引导词that无含义，不充当成分，不可省略。 ②同位语从句与其说明的名词或代词为同一内容,故可以用is把前边的中心词和从句连接成一个句子。 ③同位语从句前一般没有逗号。 that引导同位语从句与引导定语从句的区别： that引导同位语从句时只起连接作用，不充当任何成分; that引导定语从句时，在从句中要作成分，如主语、宾语等。 ①He told me the news that our team won.(that引导同位语从句) ②The news that / which he told me was very exciting.(that引导定语从句，在从句中作宾语) 2.在no idea, question, problem等后可用wh-疑问词引导同位语从句，if不引导同位语从句。 I have no idea where he has gone. i have no idea what he said. 3.辨析:引导名词性从句时what与whatever, who与whoever的区别： | 
