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one用来替代前面出现的单数名词，是泛指概念，通常替代a/an+单数名词；the one用来替代前面提到的特指的单数名词，后面总是有后置定语，有时可用that替代（尤其是在有后置定语的情况下）；ones 用来替代前面出现的复数名词，也是泛指概念；the ones 用来替代前面的特指的复数名词，有时可用those 替代（尤其在有后置定语的情况下）；that 用来替代前面出现的单数可数名词或不可数名词，只能指物，不能指人，相当于the+单数名词或不可数名词。It指代前面提到的事情或事物，强调同一性。例如： 例句： Mr. Wang gave me a very valuable present, one that I had never seen. Mr. Wang gave me many very valuable presents, ones that I had never seen. The book on the desk is better than that/ the one under the desk. The books on the desk is better than those/ the ones under the desk. Few pleasures can equal that of a cool drink on a hot day. Why don’t we take a little break? Didn’t we just have one? Meeting my uncle after all these years was an unforgettable moment, one I will always treasure. The Parkers bought a new house but it will need a lot of work before they can move in. 练习： 1. Why don’t you bring _________ to his attention that you’re too ill to work on? | 
