Thattheseasarebeingoverfishedhasbeenknownforyears句子结构分析我知道Thattheseasarebeingoverfished作主语如果不要that光是theseasarebeingoverfished能不能作主语为什么?theseasarebeingoverfished是

That the seas are being overfished has been known for years句子结构分析
我知道That the seas are being overfished 作主语 如果不要that 光是the seas are being overfished 能不能作主语 为什么?the seas are being overfished 是一个什么结构?

参考答案


光是the seas are being overfished 不能作主语,因为本身是一个独立句子了,只能做从句.
本身的主语是the seas.放在原句里面如果没有引导的that,语法错.
the seas are being overfished.结构是个 进行时的被动语态句子.

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