The box is too heavy to carry.
The box is light enough to carry.
It is difficult to answer.
这三句话中的不定式分别是什么成分?
The box is too heavy to carry. (结果状语,因为前面程度副词 too 的缘故)
The box is light enough to carry. (结果状语,因为前面程度副词 enough 的缘故)
It is difficult to answer. (两种划分:1. 是 difficult 的补充性状语;2. 整个 difficult to answer,作表语)
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