1. be 除了是系动词,后接表语外,还可以用作不及物动词,意思是“存在”,等于exsit。be 表示“存在”的意思,后面可以不接成分,包括地点状语。
2. 两个what,都是引导名词性从句,在从句中作主语。
3. 我把句子改写一下,网友就很明白了:
What will be is entirely in what has been. =
What will exist is entirely in what has existed.
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What will be is entirely in what has been.
=What will exist is entirely in what has existed
=The thing that will be is entirely in the thing that has been
未来的一切存在的事情将完全存在于已经发生的事情。
(1)为融合性关系代词/复合型连接代词what引导主语从句。
(2)为融合性关系代词/复合型连接代词what引导介词宾语从句。
(3)主语从句be相当于exist,宾语从句be相当于existed
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