这个要分析来看
1:use to do,表示过去常常做某事.I use to drink a lot of coke我过去经常喝很多可乐。
2: be used to do something: 某物是用来做某事的,比如说这本书是用来帮你学习的:this book is used to help you (to) study .
3:be used to doing something: 习惯了做某事。如:我已经习惯熬夜了:I am used to staying up late at night.
祝你进步
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