为什么这句话不定式不用被动?

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/15 22:03:39

为什么这句话不定式不用被动?
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Clusters of tin insects called aphids were to be found on the underside of the leaves .
这句话were to be found为什么不用
were found 新概念3lesson54课一句话

were found的意思是已经发现了.
were to be found表示有待发现.相当于将来时的被动形式.
一群蚜虫要在叶子的背面才能被找到.

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