3 定语从句和宾语从句that的省略

As a physician, I know the most costly and dramatic measure may be painful.

请问老师,这句话为什么是宾从省略that,即 I know thatthe most costly and dramatic measure may be painful. 而不能是定从省略that,即 I know the most costly and dramatic measure thatmay be painful.

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黎反修   - 英语翻译 (已退休)
擅长:数词用法,存在句,英语考试

          定语从句修饰名词或者代词。在你的句子中,thatthe most costly and dramatic measure may be painful 的前面没有名词或者代词,而是及物动词know,所以thatthe most costly and dramatic measure may be painful 是宾语从句,其中the most costly and dramatic measure是从句的主语。

         I know the most costly and dramatic measure thatmay be painful.你可能把这里的may be painful误认为是定语从句了。如果是定语从句,作主语的关系代词 that 是不能省略的,只有作宾语的关系代词才能省略。

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