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C6052材料表示举例关系的：例子：工作需要穿制服的好处1） To begin with, there are certain special occupations where people must wear uniforms. For instance, the police are always required to dress themselves in uniforms as a form of identity and authority. 2） It is often mandatory for workers in the public service sector to wear the same clothes, especially take nurses for example, nurses whose white garments give them an image of cleanliness and professionalism. 3） Another good case in point is factory employees who work on assembly lines-their uniforms, sometimes including a helmet and other protective pieces, are designed for safety reasons1) 表示递进关系的：例子：1) The museum conserve many kinds of rare cultural relics. Furthermore, they provide a perfect place for historians to conduct research.2) One of the main reasons why immigrants should accept the new culture is that this is the quickest and easiest way for them to settle down in a foreign country. For instance, looking for accommodation might be a very complicated matter if they are not familiar with local lifestyles. Moreover, those who have no idea of the corporate culture of the new country would encounter enormous difficulties in finding a decent job.2) 表示因果关系的：例子：1）：The ecological problems are being aggravated; therefore, it is imperative（势在必行，必要的） that we take measures to combat the pollution of the environment.2）：People pay attention to media constantly. As a result , sports professionals in my country have become stars and celebrities.3) 表示转折关系的：But = however = while = whereas 例子 ：1) Many ads and commercials do give important information about products, but / however, some of them are merely misleading and cheating.2) Some people think that studying in a college or university is the best way for students to prepare for their future career. While / whereas others believe that they should leave school as soon as possible to develop their career through work experience.复合句：定语从句，状语从句， 名词性从句1 定语从句：1） Those people who are against mandatory retirement have the following reasons.2） We should take pride in our cultural legacy which is handed down from our ancestors.3） As is known to all, the restriction on private cars is a two-edged sword.4） The reason why many governments ban human cloning is that it is morally wrong.5） This is the reason why many people are strongly against the ban on pets in big cities.2 状语从句：包括原因状语从句，目的状语从句，条件状语从句，让步状语从句原因状语从句：概述：常用because，since，for， as等来引导原因状语从句，但是四个词在使用上又略有区别。Because: 语气最强，所引出的原因往往似乎听话人所不知道的或者最感兴趣的。例子：I was absent from school because I caught a cold yesterday.Since: 表示人们已经知道的事实，是不需要强调的原因，所以被翻译成“既然”，通常放在句首。例子：Since we dont have class tomorrow, why not go out for a picnic? Since you are an English major, I guess you can help me with this sentence.As ： 和since用法差不多，所引出的理由在说话人看来已经很明显，或者已经为听话人所熟悉而不需要用because来强调。例子：As Sunday is a national holiday, all government offices will be closed.For: 表示推测的理由，是对前面主句的内容加以解释或者说明。例子：It rained last night , for the ground is wet this morning.由介词短语引导的原因状语从句Because of / due to / owing to + 名词 / 词组例子：We had an accident because he was careless.用介词短语来引导：We had an accident because of his carelessness.We had an accident due to his carelessness.Owing to his carelessness we had an accident.注意：owing to 常用于句首，due to 一般不这么用。目的状语从句：概述： 表示目的，常用的引导词有 so that , in order that 等。一般位于主句之后，引导的句子中可以用may/ can/ might/ could等情态动词。如果要强调目的状语从句，可以将so that / in order that 引导的从句置于句首。例子：I turned off the TV in order that my roommate could study in peace and quiet. In order that my roommate could study in peace and quiet., I turned off the TV. (此句强调目的状语从句) 条件状语从句：概述：常用if , unless 来引导，if 表示“如果”， unless表示“如果不 ，除非”。还可以用 as long as / so long as /provided 等来引导,表示“只要”例子：if winter comes, can spring be far behind? 冬天来了，春天还会远吗？ Inside the book you will find a series of successful skills and suggestions for improving your English, but these will be useless unless you carry them out. So long as you work hard enough , an iron rod can be ground into a needle. 只要功夫深，铁棒磨成针。 A man is not old as long as he is seeking something. A man is not old until regrets take the place of dreams. Knowledge helps you to reach the destination provided you know what the destination is.让步状语从句：概述：常用” though / although / even though / even if 来引导，主句不能用 but 或者可以用 in spite of / despite 介词来引导，需要注意的是，介词后跟的必须是短语 ，而不是句子。例子：Although he tired hard, he failed.尽管他尽力了，他还是失败了。 Even though I didnt know anybody at the party, I had a good time. Though he was inexperienced, he did a good job. = In spite of his inexperience, he did a good job. = Despite his inexperience, he did a good job.3 名词性从句： 包括主语从句，表语从句，宾语从句，同位语从句主语从句：即从句在主句中当主语常见句型：It is +过去分词+ that 从句1） It is reported / believed / generally thought that.2） It should be noted that3） It has been found that4） It must be pointed out that例子：It is reported that it will rain tomorrow.It is +形容词+that 从句It is true / possible / necessary / clear / likely that.例子：It is true that English is becoming an international language.It is + 名词短语+that 从句It is a pity / a fact / no wonder / an honor / a shame / common knowledge that例子：It is common knowledge that the whale is not a fish. It is a shame that you did not pass the exam.表语从句：即从句在主句中当表语（句子通常在be 动词的后面）例子：1） My idea is that the child should be sent to school.（表语从句如果是陈述句，用 that引导，且不能省略）2） My concern is whether he comes or not.（表语从句如果是一般疑问句，用whether来引导，后面加陈述句）3） The point is when you will become rich.(表语从句如果似乎特殊疑问句，用特殊疑问词来引导，后面加陈述句)同位语从句：即用一个完整的句子来补充说明名词，一般位于一个名词的后面，结构是 ：名词 + 连词 + 同位语从句例子：1） The fact that he succeeded in the experiment pleased everybody.2） He was prepared to prove his theory that two different weights would fall to t