it is not only of immense size but is extremely accurate as well请问BUT后为什么有IS?省略IS有区别吗

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it is not only of immense size but is extremely accurate as well请问BUT后为什么有IS?省略IS有区别吗
it is not only of immense size but is extremely accurate as well请问BUT后为什么有IS?省略IS有区别吗

it is not only of immense size but is extremely accurate as well请问BUT后为什么有IS?省略IS有区别吗
这是not only but also句型,前后是两个句子,所以都要有is.
如果不要is,则后面的成分就与of immense size 相当,如果这样则extremely accurate 就应该是名词形式(像immense size )才行.但是如果这样意思就完全不一样了.

主要是考虑到句子结构平衡性问题.not only.... but also....要连接两个地位对等的成分,或同不句子结构,或名词性短语或形容词性短语等.it is (not only )of immense size 是"主+系动+介宾";is extremely accurate accurate 是"(主+)系动+形容词性短语";如果省略系动is,刚结构不对称,故保留句子结构....

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主要是考虑到句子结构平衡性问题.not only.... but also....要连接两个地位对等的成分,或同不句子结构,或名词性短语或形容词性短语等.it is (not only )of immense size 是"主+系动+介宾";is extremely accurate accurate 是"(主+)系动+形容词性短语";如果省略系动is,刚结构不对称,故保留句子结构.

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