到底神马时候用that 和what (同位语从句中)对比:) I have no idea what has happened to her .(2) Suddenly the thought came to him that he could go blind.这两句中what 和that 可以互换吗?

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到底神马时候用that 和what (同位语从句中)对比:) I have no idea what has happened to her .(2) Suddenly the thought came to him that he could go blind.这两句中what 和that 可以互换吗?
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到底神马时候用that 和what (同位语从句中)对比:) I have no idea what has happened to her .(2) Suddenly the thought came to him that he could go blind.这两句中what 和that 可以互换吗?
到底神马时候用that 和what (同位语从句中)
对比:) I have no idea what has happened to her .
(2) Suddenly the thought came to him that he could go blind.
这两句中what 和that 可以互换吗?

到底神马时候用that 和what (同位语从句中)对比:) I have no idea what has happened to her .(2) Suddenly the thought came to him that he could go blind.这两句中what 和that 可以互换吗?
不能替换,(1)句中what在同位语从句中作主语(从句缺了主语)
(2)句中that只起连接作用(因为从句中不缺成分,也没有疑问)

当然不能互换, 这两个都可以引导各种各样的从句, 从句里that有时作成分比如定语从句, 有时不做成分,比如同位语宾语从句. 分不同的从句不同情况, 而what一般都做成分. 建议你买无敌英语语法, 把从句部分从头到尾好好看一遍就能搞得很透彻

用what时,从句缺成分,如上句 I have no idea what has happened to her .what作从句的主语,有时也做宾语或表语,因此从句如果缺主语、宾语或表语,就用what;that引导同位语从句时不作成分,只起连接作用。如上句that he could go blind,去掉that,意义完整he could go blind,因此从句意义完整,不缺主语、...

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用what时,从句缺成分,如上句 I have no idea what has happened to her .what作从句的主语,有时也做宾语或表语,因此从句如果缺主语、宾语或表语,就用what;that引导同位语从句时不作成分,只起连接作用。如上句that he could go blind,去掉that,意义完整he could go blind,因此从句意义完整,不缺主语、宾语或表语,就用that.

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