一、be used for +名词或动词-ing,意为“用于”、“被用来供……”,介词for表示“用途”。例如:
A stamp is used for sending letters.邮票用来寄信。
A brush pen is used for writing.毛笔用来写字。
二、be used as +名词,意为“被用来当作……”,介词as表示“作为”。例如:
This room is used as their office.这个房间被用作他们的办公室。
But it is also used very widely as a foreign lan- guage in many other countries of the world.但在世界上许多其他国家里它(英语)也作为一种外语被广泛使用。
三、be used to +动词原形,意为“被用来……”。其中used为use的过去分词。例如:
The knife can be used to cut meat.刀能用来切肉。
四、used to +动词原形,意为“过去常常……”。例如:
He used to go to church on Sundays.他以前每个星期天都去教堂。
She used to get up early.她过去习惯早起。
五、be /get used to +名词或动词-ing,意为“习惯于……”。其中used是形容词,to为介词,其后接名词或动词-ing。例如:
I'm not quite used to the weather here yet.我还不太习惯这儿的天气。
She isn'tused to staying up late.她不习惯熬夜。
He has got used to living in the city.他已习惯于住在城市里了。