1、It is for the benefit of maintaining the ecological balance thathuman beings ought to protect the endangered animal species.

正是为了维持生态平衡，人类才应该保护地球上濒危的动物物种。

2、It is not until people suffer from some fatal diseases such as SARSand AIDS that they are becoming aware of how significant it is for thegovernment to invest more money in medical care.

直到人们患了像非典和爱滋病这样致命的疾病时，才意识到政府把更多的钱投入到医疗上的重要性。

假设句

1、If we destroy old buildings, then we will ruin the traditionalculture and heritage. 

如果我们推倒老房子，就要破坏传统的文化和遗产。

2、You would miss the chance to interact with other students if youused internet at home. 

假如你在家上网，你就会失去与其他同学交流的机会。

3、Once you change your present job, you will be faced with the dangerof being unemployed. 

一旦你变换了现在的工作，就面临着失业的危险

让步句

1、This view is widely acknowledged；however，there is little evidence that smoking is beneficial to people’s health.

这个观点被广泛认可，然而，几乎没有证据表明吸烟对人们健康有利。

2、Although(While) the computer has been widely used in class, itcannot replace the role of teachers. 

尽管计算机已经广泛用于课堂，但是它不能取代教师的作用。

非限制性定语从句

1、Undoubtedly, practical courses can be used to the reality, which isof vital importance to their development in the future. 

毫无疑问，实用性课程可以用于实际中，这对于他们未来发展是非常重要的。

2、Children tend to imitate what they have seen and heard>孩子们倾向于模仿大众媒体上的所见所闻，这在有时是危险和有害的。

3、The majority of students believe that part-time jobs will providethem with more opportunities to develop their interpersonal skills, which mayput them in a favorable position in the future job markets. 

大部分学生相信业余工作会使他们有更多机会发展人际交往能力, 这对他们未来找工作是非常有好处的

原因句

1、Violent films can do harm to young people, because

they containsnumerous negative information. 

暴力影片对年轻人是有害的，因为其中包含大量负面信息。

2、Human beings are chiefly responsible for wild animalextinction.  

野生动物灭绝的主要责任在人类。

3、We should attribute (ascribe)medical advances to the animals whichdo substantial contributions to the experiment. 

我们应该把医学的发展归因于动物对实验做出的巨大贡献。

It 引导的句子

1、It is hard to imagine what our life would look like withoutcomputers in modern society. 

很难想象如果现代社会没有了计算机，我们的生活会变成什么样子。

2、It is conceivable that being physically active does good to health. 

可想而知，积极参加体育活动有利于身体健康。

3、It is a highly controversial issue whether women should join thearmed forces or not. 

女性是否应该参军是一个非常有争议的问题。

4、It is universally acknowledged that water and air are indispensableto human beings.  

人们普遍认为，水和空气对人类不可缺少。

5、It is essential that endangered species of animals be protected againstbeing killed.

保护濒危的动物物种免遭残杀是必需的。

1、Studies show that juvenile delinquency rates are twice as high foryoungsters from single-parent    families as for those intraditional households. （同级比较）

研究表明来自单亲家庭的青少年犯罪率是来自传统家庭的两倍。

2、Generally speaking, people in modern times enjoy less leisure timethan they did previously. （比较级）

1、Computers, most important of all, create wide communication aroundthe world. 最重要的是，计算机在世界范围内建立了广泛的交流。

2、Providing more parking areas, in the long run, has proved to be apractical way out in many large cities in the world. 

从长远的利益来看，提供更多的停车位证明是许多世界大城市切实可行的出路。

3、Space exploration, some people believe, will bring some unexpecteddiscoveries. 

有人相信空间探索将会带来意想不到的发现。

倒装句

1、Only in this way can the problem be tackled properly. 

只有这样才能妥善地解决这个问题。

2、Only when children take arduous efforts can they become successful. 

只有当孩子们付出艰苦的努力他们才能获得成功。

3、Not>在校学习不仅为了学术目的，而且还可以学会如何处理人际关系。

4、Under no circumstances should youngsters follow negative informationon mass media blindly. 

青少年决不应当盲从大众媒体上的不良信息。

否定句

1、Instead of indulging in playing computer games, children should betaught how to benefit from useful information>应该教孩子们如何从互联网获取有益的信息，而不是沉溺于玩电脑游戏。

2、On no account (Under no circumstances)can we ignore the immensevalue of knowledge. 

我们绝不能忽视知识的巨大价值。

3、College students take part-time jobs not for more money but for abetter understanding of societies.  

大学生参加兼职工作不是为了赚更多钱，而是为了更好地了解社会。

4、One’s salary doesnot depend so much>一个人的工资与其说取决于他的教育背景倒不如说取决于他的能力和对社会的贡献。

5、In terms of nutrition, fast food is far from satisfactory. 

从营养角度来说，快餐远非令人满意。

6、Parents would not expect their children to become useful personswithout working hard. 

父母们不能指望孩子们不经过刻苦努力就可以成才。

这一观点正受到越来越多人的质疑。

Using bicycle contributes greatly to people's physical fitness as well as easing traffic jams.

使用自行车有助于人们的身体健康，并极大地缓解了交通阻塞。

Despite many obvious advantages of bicycle, it is not without its problem.

尽管自行车有许多明显的优点，但是它也存在它的问题。

Bicycle can't be compared with other means of transportation like car and train for speed and comfort.

在速度和舒适度方面，自行车是无法和汽车、火车这样的交通工具相比的。

From what has been discussed above, we may safely draw the conclusion that advantages of bicycle far outweigh its disadvantages and it will still play essential roles in modern society.

通过以上讨论，我们可以得出结论：自行车的优点远大于缺点，并且在现代社会它仍将发挥重要作用。

There is a general discussion these days over education in many colleges and institutes. One of the questions under debate is whether education is a lifetime study.

当前在高校和研究机构对教育存在着大量争论，其中一个问题就是教育是否是个终身学习的过程。

This issue has caused wide public concern.

这个问题已经引起了广泛关注。

As for me, I'm in favor of the opinion that education is not complete with graduation, for the following reasons：

就我而言，我同意教育不应该随着毕业而结束的观点，有以下原因：

It is commonly accepted that no college or university can educate its students by the time they graduate.

人们普遍认为高校是不可能在毕业的时候教会他们的学生所有知识的。

Even the best possible graduate needs to continue learning before she or he becomes an educated person.

即使最优秀的毕业生，要想成为一个博学的人也要不断地学习。

It is commonly thought that our society had dramatically changed by modern science and technology, and human had made extraordinary progress in knowledge and technology over the recent decades.

人们普遍认为我们的现代科技使我们的社会发生了巨大的变化，近几十年人类在科技方面取得了惊人的进步。

Now people in growing numbers are beginning to believe that learning new skills and knowledge contributes directly to enhancing their job opportunities or promotion opportunities.

现在越来越多的人开始相信学习新的技术和知识能直接帮助他们获得工作就会或提升的机会。

An investigation shows that many older people express a strong desire to continue studying in university or college.

一项调查显示许多老人都有到大学继续学习的愿望。

For the majority of people, reading or learning a new skill has become the focus of their lives and the source of their happiness and contentment after their retirement.

对大多数人来讲，退休以后，阅读或学习一项新技术已成为他们生活的中心和快乐的来源。

job will strongly support students to continue to their study life.

因此，业余工作挣来的钱将强有力地支持学生们继续他们的求学生活。

These days, people in growing numbers are beginning to complain that work is more stressful and less leisurely than in past. Many experts point out that, along with the development of modern society, it is an inevitable result and there is no way to avoid it.

现在，越来越多的人们开始抱怨工作比以前更有压力。许多专家指出这是现代社会发展必然的结果，无法避免。

It is widely acknowledged that computer and other machines have become an indispensable part of our society, which make our life and work more comfortable and less laborious.

人们普遍认为计算机和其他机器已经成为我们社会必不可少的一部分。它们使我们的生活更舒适，减少了大量劳动。