宾语从句中,what怎么用,它跟that有什么区别?

如题所述

that:
陈述句做宾语从句时,用 that 连接,that 在句中没有实际意义,不能充当句子成分,口语中可以忽略
例句:I think (that) he will come at once.
what:
特殊疑问句做宾语从句时,用 what,when,who,which等引导
例句:I don't understand what he really wants.
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