1、意思不同
used to do解释成“过去常常做某事”，后面接动词原形。
例：I used to play basketball.我过去常常打篮球。
am/is/are used to doing解释成“现在习惯做某事”。
例：I am used to playing basketball.我习惯打篮球。
2、用法不同
was/were used to doing解释成“过去习惯做某事”。
例：I was used to playing basketball.我过去习惯打篮球。
be used to do解释成“被使用去做某事”。
used to do sth.过去常常做某事,(意思现在不做了)。
be used to doing sth / be used to sth .是指习惯于做某事.(这里的to 是介词.)
扩展资料：
动词不定式形式：
1、 现在式：一般现在时表示的动词，有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。一般为：动词+ to do something
He seems to know this.
I hope to see you again. = I hope that I'll see you again. 我希望再见到你。
2、完成式：表示的动作发生在谓语动词表示的动作之前。
I'm sorry to have given you so much trouble.
He seems to have caught a cold.
3、进行式：表示动作正在进行，与谓语动词表示的动作同时发生。
He seems to be eating something.
4、完成进行式：
She is known to have been wreaking on the problem for many years.
一般在表示情绪的动词后加to do也表将来
①Did they use to play football？他们过去踢足球吗？
②Did you use to smoke？你过去吸烟吗？
③Did you use to take long walks in the countryside？你过去在农村经常进行长距离的散步吗？
二、在带有used to的陈述句后面，附加疑问句中一般要使用功能词did。但是，在附加疑问句中也可以用used。例如：
①He used to smoke，didn't he？
②They usedn't to like opera，did they？
They didn't use to like opera，did they？
They used not to like opera，did they？
③You used to live in Wuhan，usedn't you？
④You used to like wine，use（d）n't you？
三、used to的否定形式的一般问句常有以下两种。例如：
Didn't you use to live near me？
Usen't you to live near me？你过去不住在我附近吗？
四、used to指的是过去的习惯性动作，目的在于与现在形成对照，如：I used to work hard．是说“我过去常常努力工作。”暗含的意义是：我现在不努力工作了。在表示过去的习惯性这一点上，与would的意义相同（只不过used to既可用于表示过去的习惯动作，又可用于表示过去的状态。would只能用于表示过去习惯性的动作）。从形态上看used to是个情态动词，其中的to是不定式符号，后面跟动词原形。例如：
When I was a child，I would get up early．
People used to（不用would）believe the earth was flat．过去人们认为地球是平的。
I used to like swimming．
When I was a child，I used to（不用would）like swimming．
我哥哥过去是解放军，现在是教师。
误：My elder brother would be a PLA man．He is now a teacher．
正：My elder brother used to be a PLA man． He is now a teacher．
五、be（get，become）used to结构在意义上相当于accustomed to“习惯于”，从形态上看，used是个分词型形容词，to是介词，因此后面只能跟名词、代词或动名词。例如：
They got used to living in the countryside．他们已习惯于住在农村。
I've got used to being a vegetarian．我已经习惯吃素食。
He is used to hard work．他习惯于艰苦工作。
六、be used to表示“习惯于某事”的状态，而get used to则表示由“不习惯”到“习惯于”这一动态的过程，意思是：“（变得）习惯于”；“开始习惯于”。试比较：
He was used to the cold weather after he lived there for two years．在那里住两年后，他已习惯了寒冷的天气。
I think it is a bit difficult for you to get used to the humid weather here．我想，让你习惯于这里潮湿而炎热的天气有点困难。
You'll soon get used to living in the country．很快你就会习惯于住在乡下了。
七、有时be used to是动词use的被动语态，在这种结构里，to是不定式符号。例如：
A metal bar was used to force the door open．用金属棒把门撬开。
The threshing ground was used to hold a mass meeting．打谷场曾用于举行群众大会。
八、be used to与be accustomed to的区别：前者一般用于指自然而然地成为习惯，后者常常用于指通过努力而成为习惯。试比较：
I am used to teaching English．我对教英语已习惯了。
Mrs Smith was not accustomed to leaving home during the winter．史密斯夫人不习惯冬天出门。
I am accustomed to taking coffee．我习惯了喝咖啡。
i used to get up early in the morning when i was still a hight school student.
be used to doing 表示习惯于做某事
i am used to eating rice now.
be used to do表示...被用来做某事
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习惯做