Bill works harder than Joe 为什么works的后面不加is.

来源：学生作业帮助网编辑：作业帮时间：2024/05/16 00:42:36

works 是动词 work 的三单形式,如果后面在接is ,变成一个句子有两个动词了.不对的.

因为句子中已经存在一个谓语动词works 一个句子中只能有一个谓语动词所以不加is
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Bill works harder than Joe (does). -------- 因为这个句子裏面没有be动词作为谓语动词，只有实意动词work,它的助动词是do / does.

than后面的宾语可以省略到原句中的主语，也可以加上与前面works相对应的助动词does
所以这个句子可以表示成：
Bill works harder than Joe。
或Bill works harder than Joe does。

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