(6)set about还可指"攻击"，及物性短语动词。e.g.
Our dog set about the postman.我们的狗追着要咬邮递员。
(1)be used as与be used for，be used to sth./doing sth，be used to do sth.的区别：
be used as和be used for都意为"用作"，不同的是as后通常接名词，for后多接v.-ing;be used to sth./doing sth.意为"习惯于某事/做某事"，to在这里是介词;be used to do sth.意为"被用于做某事";used to do 意为"过去常常做某事"，used to这里是助动词：e.g.
①During the war the castle was used as a prison.战争期间城堡用来作监狱。
②During the war the castle was used for keeping prisoners in.战争期间城堡用来监禁囚犯。
③I'm used to the noise.我对这噪音已经习惯了。
④I'm not used to getting up early.我不习惯于早起。
⑤Wind can be used to produce electricity·风可以用来发电。
⑥This river used to be clean.这条河以前是干净的。
(2)a cure for...与cure sb.of...的区别：
a cure for...意为"对…的治疗"，cure这里作名词;"cure sb. of"意为"治好或治愈某人的...病"，cure这里作及物动词。e.g.
①This is a certain cure for your laziness.这是治懒惰的特效药
②Moving to the country cured her of asthma.搬到乡下她的哮喘就好了。
be admired as与be admired for的区别：
(1)be admired as意为"被当作……为人们所钦佩"，as是介词，意为"作为"。
(2)be admired for意为"因(某种原因)而为人们所钦佩"，for是介词，表示原因。e.g.
mired for his frankness.他以他的坦诚实在为人们所钦佩。
pay off与pay for，pay，pay...for...的区别：
pay off + debt指"还清"债款
pay for sth.指"对(某物)的款"
pay sb.some money意为."付给某人(多少)钱"。
pay sb./money for sth.意为"付给(某人款/钱买某物)"。 e.g.
①She tried to leave the shop without paying for the dress.她企图买衣服不付款就离开商店。
②He paid the servant 5 dollars to wash his car.他付给佣人五元钱叫他洗车。
③He paid her for the work.他付给她工钱。
④I paid ￡200 for the painting.这幅画我花了二百英镑。
⑤Did you pay him l00 dollars for that old bike你付给他那辆旧自行车了吗?
语法教学：
复习定语从句
定语从句分为限定性定语从句和非限定性定语从句。
1) 限定性定语从句：限定性定语从句对所修饰的先行词起限定作用。 限定性定语从句中关系词的使用列表如下：
在句中的作用关系词说明
主语 关系代词：who/that(指人) which/that(指物 关系代词不能省略
宾语 who/whom/that(指人)
which/that(指物) 关系代词在非正式
文体中可以省略
定语 whose 名词前表所有关系
介词+关系代词 whom(指人) which(指物) 关系代词不能用who或that
whose(定语) 名词前表所有关系
状语 关系副词：when(时间) where(地点)why(原因) 先行词为表时间、
地点等的名词
例：
①Anna was an American writer who/that interviewed Mao Ze dong in Ya'an.(指人作主语)
安娜是一位当年曾在延安采访毛泽东的美国作家。
②The friends whom/who/that we met in the park were from Egypt.(指人作宾语)
我们在公园里遇见的朋友来自埃及。
③A taxi is a car (that/which)you can hire.(指物作宾语) 出租车是你可以租用的小汽车。
④Many forests where the animals lived were destroyed.(作状语)
动物栖息生活的许多森林遭到破坏。
⑤We ought to help those families whose men are in the army.(作定语)
我们应该帮助那些男人在部队的家庭。
⑥He looked at the box from which the voice came.(介词+关系代词)
他看着那只传出声音的方箱子。
2)非限定性定语从句：非限定性.定语从句对所修饰的先行词(句子)起补充说明的作用，不起限定作用。从句中使用关系代词who，whom，which，whose和关系副词when，where等，不使用关系代词that，作宾语的whom不能用who代替。
例：They visited the city of Hangzhou，which is famous for its beautiful scene.他们参观了杭州城，它以风景秀丽而闻名。
非限定性从句中关系词指代整个句子时，用关系代词which。试比较：
①Big floods hit some parts of China in the summer of 1998,which caused a great damage to the country.1998年夏中国部分地区遭受特大洪灾，给国家带来了巨大损失。(指代整个句子)
②They got married on July 1，1997，when Hong Kong returned to our motherland.他们于1997年7月1日喜结良缘，香港在这一天回归祖国。(指代时间作状语)
