请问"She rans much faster than her sister does."一句中的does 是必须的吗?比较句中的助动词什么情况下

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请问"She rans much faster than her sister does."一句中的does 是必须的吗?比较句中的助动词什么情况下

ran是run的过去式,过去式不用加第三人称单数.She runs much faster than her sister does才是对的.does是必须的.这句话中的than表明这是一个比较句式,比较句的前后句子成分必须相同,这句话的完整形态是She runs much faster than her sister runs,she runs 和her sister runs的句子成分才是相同的,这里的runs可以用does代替.如果分句中动词短语很长的话后面一句话用does替代就就很简洁,这句话比较简单没有体现出来.

比较句中后一个比较对象的助动词是可以省略的，目的是为了句子看起来不冗余，原句：She rans much faster than her sister runs.句子中出现两个相同的谓语动词就显得重复，does在这里没有省略是起到了强调的作用，不是必须有的，若想起到强调作用，那么，可在后一比较对象加助动词。
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比较句中后一个比较对象的助动词是可以省略的，目的是为了句子看起来不冗余，原句：She rans much faster than her sister runs.句子中出现两个相同的谓语动词就显得重复，does在这里没有省略是起到了强调的作用，不是必须有的，若想起到强调作用，那么，可在后一比较对象加助动词。
希望对您有所帮助！！！

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一般都可省略。

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