used to do、be used to do与be used to doing sth.的用法详解

used to do 过去常常做某事

be used to doing 习惯于做某事

be used to do sth 被用来做某事

1. used to的一般疑问句有两种构成方法：

1）将used提前至句首，结构为：Used + 主语+ to do sth...?

2）将did提前至句首，结构为：Did + 主语+ use to do sth...?

例如：Used he to get up early?

= Did he use to get up early?

2. used to的反义疑问句有两种构成方法，例如：

1）He used to smoke，didn't he？

2）They usedn't to like opera，did they？

3. 同样，其否定句也有两种构成方式：

1）直接在used后面加上not，也可一起缩写成usedn't.

结构为：主语+ used not to do sth... 或主语+ usedn't to do sth...

2）借助于助动词didn't，其结构为：

主语+ didn't use to do sth....

例如：He used not to get up early.

= He usedn't to get up early.

= He didn't use to get up early.

4、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：

1）They got used to living in the countryside．他们已习惯于住在农村。

2）I've got used to being a vegetarian．我已经习惯吃素食。

3）He is used to hard work．他习惯于艰苦工作。

5、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。

6、当主语是物的时候是指被用来做某事，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。