used to / be used to / be used for
I used to swim. / I am used to swimming. / It is used for cutting.
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说明
used to do = 过去常常（现在不做了）；be used to doing = 习惯于；be used to do = 被用来做。三个结构意思完全不同，是高频易错点。
同类条目
- 主谓一致：就近原则 —— Either you or he is right.
- 现在完成时 vs 一般过去时 —— I have lived here for 5 years. / I lived there in 2010.
- 定语从句：that 与 which —— The book that/which I bought is good.
- 虚拟语气：if 条件句 —— If I were you, I would take it.
- 非谓语：doing 与 to do —— I enjoy reading. / I want to go.
- 倒装：否定词提前 —— Never have I seen such a thing.
- 比较级：as ... as 与 than —— He is as tall as I am. / He is taller than I am.
- 情态动词表推测 —— It must be true. / It can't be true.
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