used to 和be used to的区别

一、在英国英语中传统上把used to看作是情态动词,因此,它的疑问式应当是：Used ＋主语＋to sth．?否定式应当是used not to或use（d）n't to.但是,在美国英语中,人们把used to看作是实义动词,因此,它的疑问式是：Did ＋主语＋use to do sth．?否定式是：主语＋didn't use．．．由于受到美国英语的影响,甚至在英国英语中,人们也很少使用“Used．．．＋主语＋to．．．”这种疑问式,而使用“Did ＋主语＋use．．．”这一疑问式.例如：
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.