核心问题
However, after a few hours of study you will manage to know enough to save other people's lives. [《高中英语教科书》第二册(上), 人教社, p. 44]
与该书配套的《教师教学用书》(p.141)说：“句中 enough 是名词，作‘足够的东西’解。”
请问句中的 enough 是名词吗?
词典解答
有些英语辞书把上面用法的 enough 看作是名词。但是,如果把此种用法的 enough 说成是名词,那学生就可能提出这样的问题:enough 应看作是可数名数,还是不可数名词?它的复数形式是什么?它的所有格形式是什么?这是很难回答的。
因此,有很多英语辞书把此种用法的 enough 看作是不定代词。不定代词 enough 可用带 to 的动词不定式来修饰,也可用介词短语来修饰:
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She hasn't got enough to do. 她没有足够的活干。
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There is enough of the water to last several weeks. 有足够的水,可使用好几周。
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She knows enough about the topics to explain it to you. 关于这些题目她有足够的知识来向你解释清楚。
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I hope enough of you are prepared to help with the show. 我希望你们中能有足够的人手准备协助这场演出。
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They were able to save enough of their furniture to fill a room. 他们能省出的家具足够装满一间屋子。