我们一直与我们的美国朋友保持联系。
6. be used for，be used to do，be used as
(1) be used to do实际上是use sth. to do…的被动式。
e.g. Wood is used to make paper. 木头可用来造纸。
(2)be used for是“被用作……”，许多时候可能和“be used to do”互换。如上例也可表示为：
Wood is used for making paper.
e.g. Paper can be used for writing.=Paper can be used to write on.
纸可以用来写字。
(3)be used as 是“被用来作为……”，as是介词。
e.g. A check of 1 500 was used as a book mark by Einstein.
爱因斯坦曾把一张1500美元的支票当书签用。
7.wh-ever的用法归纳
(1)whatever，whichever，whoever，whomever可以引导名词性从句，也可以引导让步状语从句，引导让步状语从句时，可以换成no matter what/which/who/whom，位置可在主句前，也可在主句后。
e.g. (1) Take whatever you want.(宾语从句)
你可以拿你想要的任何东西。
(2) Whoever breaks the law should be punished.(主语从句)
不管谁违反了法律都应受到惩罚。
(3) We will complete the work on time，no matter what happens.(状语从句)
=Whatever happens，we will complete the work on time.
不管发生什么事，我们都将按时完成工作。
(2)wherever，whenever，however只能引导让步状语从句，可以换成no matter where/when/how，可放在主句前或主句后。如：
e.g. (1) Whenever he goes abroad，he will buy presents for his sister.
=No matter when he goes abroad，…
不论何时出国，他都为她的妹妹买些礼物。
(2) You can go no matter where you like.
=You can go wherever you like. 你想去哪里就去吧。
(3) He can go however he likes. 他爱怎么去就怎么去好了。
注意：however还有“无论多么”的意思。如：
e.g.(1) However cold it was，he wanted to go swimming.
不管天气多么冷，他都想去游泳。
(2) However rich people are，they always want more.
不论有多富，人们总是不停地追求。
however 单独用还可以表示转折，意思为“但是”
e.g. He was ill. However, he went to work.
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