1.I can't hear what you said.what为什么不能换成that2.what和that在引导从句的区别

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1.I can't hear what you said.what为什么不能换成that2.what和that在引导从句的区别
1.I can't hear what you said.
what为什么不能换成that
2.what和that在引导从句的区别

1.I can't hear what you said.what为什么不能换成that2.what和that在引导从句的区别
首先要明确这是一个宾语从句,属于名词性从句（即：主语从句,表语从句,宾语从句,同位语从句）的一种.在名词性从句中that只起到连接的作用,在从句中不做成分.所以说如果宾语从句（名词性从句都是）从句部分不缺成分,那么你可以放心的用That,如果缺成分那么就不能考虑that,而用其他的关系词了.
定语从句中that既连接句子,还在从句中做成分.what不引导定语从句（注意哦）
而本句子的从句部分（I can not hear为主句,后面的应是you said sth为从句,sth 就是从句缺少的宾语部分）缺少宾语,所以不能用that,只能用what来引导从句

第一句是个宾语从句，what 充当said的宾语，而that不可以
一般情况下that在从句中不做成分，而what做成分，主要做主语、宾语

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1. I can't hear what you said.
what为什么不能换成that
词句为宾语从句。在宾语从句中，若从句不缺任何成分，则可用that.
词句显然said后缺宾语。所以不能换成that.
2. what和that在引导从句的区别
两词都能引导宾语从句（包括主语从句，表语从句，同位语从句）。
that无任何意义，不充当任何成分。
what在从句中可充当主语，宾语，表语，定语。含义为什么东西或什么样的。
两词也都能引导定语从句。
此时两词都要充当一定成分。that常替代已知事物或人。what做引导词，常无先行词。

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