China is no longer what she used to beThe reason why I was sad was that he didn't understand me.这两个都是有表语从句,但为什么what前又不加be动词,that前就要加was?

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China is no longer what she used to beThe reason why I was sad was that he didn't understand me.这两个都是有表语从句,但为什么what前又不加be动词,that前就要加was?
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China is no longer what she used to beThe reason why I was sad was that he didn't understand me.这两个都是有表语从句,但为什么what前又不加be动词,that前就要加was?
China is no longer what she used to be
The reason why I was sad was that he didn't understand me.这两个都是有表语从句,但为什么what前又不加be动词,that前就要加was?

China is no longer what she used to beThe reason why I was sad was that he didn't understand me.这两个都是有表语从句,但为什么what前又不加be动词,that前就要加was?
第一句,China is what.这就是主干,what 引导了一个表语从句.
no longer只是来表示程度而已.
第二句,the reason后面的why was sad 是reason的定语,用that引导一个表语从句,来说明reason的内容.
其主干是the reason was that he didn't understand me.
用that引导,是因为所引导的从句中没有缺少任何成分.也就是说主、谓、宾齐全.