句子结构

So can the movements of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.

这句话前面是根据上文省略了动词并且倒装了吗，后面when这里为什么有逗号隔开，when后面接哪里，这句话的各部分和正常语序应该是？

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分类：句法问题

最佳答案 2022-10-30 11:13

But daily vertical movements by zooplankton in the ocean — upward by night to seek food, downward by day to escape predators — can also be considered migration. So can the movement of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.

第一句主要结构为：

daily vertical movements by zooplankton in the ocean can also be considered migration

第二句表示the movement of aphids也可以被视作migration，用了常见的so+助动词+主语的倒装结构。

第二句可以简化为：

So can the movement of aphids when their offspring then fly onward to a different host plant。

因为when状语从句中主语their offspring前插入了having depleted the young leaves on one food plant，所以两边加了逗号。

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huck finn - 语言学爱好者

擅长：语言学 | 采纳率 59% | 回答于 2022-10-22 23:20

句子结构

最佳答案 2022-10-30 11:13

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