be used 的用法

be used 的用法
be used to/as/by/for 区别,

used to + 动原,“过去常常”,
He used to drank.
be used to 译为“被用来…”,后接动原.
It is used to cut things.
be used to 译为“习惯于…”,后接动词ing或名词/代词.
如：
He’s used to working late.
We are all used to following others.
be used for + 目的（名词或动词ing）
如：English is used for business./Knives are used for cutting things.
In most cases,this module should only be used for debugging purposes.
在大多数情况下,这个模块只是用于调试目的.
However,it will need many more studies before the technique used in this
study can be used for diagnosis.
不过,在这项研究采用的技术能够被用于临床诊断之前,还需要进行更多的研究.
Theoretically,they could still be used for chewing,but in one third of
people,they can come in sideways,impacted,or can cause pain and infection.
理论上来说,它们现在仍然可以用于咀嚼,但是大约三分之一的人的智齿从侧面萌出,就可能会导致疼痛和感染.
再问： asby 呢？
再答： ◆be used for doing sth. 意思是“被用来做……”。这是一个被动结构，介词for表示“用途”，后面跟动词的-ing形式。 Metal is used for making machines. Pens are used for writing. 金属被用来造机器。钢笔被用来写字。 ◆be used as意思是“把……当做……用。”例如： The computer can be used as a tool. English is used as a very useful working language. 计算机可以被当作工具用。英语被用作一种非常有用的工作语言。 ◆be used by意思是“被（某人）使用”的意思，by后接动词“use”的执行者。例如： The recorder is used in class by teachers. 录音机被老师们上课时使用。 另外，需要弄清楚used to do 和be used to +n./ving 的意思。 1. I used to play the piano, but now I am interested in playing basketball. 2. Tom has got used to the life in Yichang. 3. We are used to getting up early every day.