To drink a cup of water after getting up seemed to her a rule never to be broken .为什么用 to drink .

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To drink a cup of water after getting up seemed to her a rule never to be broken .为什么用 to drink .
To drink a cup of water after getting up seemed to her a rule never to be broken .为什么用 to drink .

To drink a cup of water after getting up seemed to her a rule never to be broken .为什么用 to drink .
因为To drink a cup of water after getting up 这部分是主语
如果不加to,drink a cup of water after getting up 是个动词词组,没有名词性质,这样是不能做主语的
To drink a cup of water after getting up(主语) seemed (系动词)to her(状语) a rule(表语)never to be broken (不定时短语做后置定语,修饰a rule)