句子是构成文章的基本框架。如何写出流畅、漂亮的句子是决定整篇文章是否成功的关键。学生在学习大学英语的过程中，对长句的表达或多或少都有了一定的理解，但是在写作的过程中却依然存在着句型结构过于简单，词汇运用过于局限的情况。因此，如何使句子在正确的基础上增强表现力，是学生们急于解决的问题。关于如何写出经典句型，我们可以从以下几个方面适当地改变：
1. 句型要丰富多彩，不要使用只有主谓宾、定状补的简单句型结构，也不能总使用There be 句型。
2. 可以尝试使用倒装句型，包括介词短语提前、时间状语提前、副词提前等。
3. 可以尝试使用If引导的条件句、虚拟语气等。
4. 注意连接词的灵活应用。例如表示转折的时候不要只用but,还可以用however, whereas, yet等。
5. 可以尝试使用从句结构，包括定语从句、状语从句等。如果担心从句的正确性，考生可以采用结构相对简单的从句。
6. 可以尝试使用并列句型，如on the _disibledevent=The main reason why the juveniles commit crimes is that social environment is becoming worse。
经典句型
1. According to a recent survey, four million people die each year from diseases related to smoking. 根据最近的一项调查，每年有400万人死于与吸烟相关的疾病。
2. The latest surveys show that quite a few children have unpleasant associations with homework. 最近的调查显示相当多的孩子对家庭作业感到不满。
3. No invention has received more praise and abuse than Internet. 没有一项发明像互联网这样受到如此多的表扬和批评。
4. Many experts point out that physical exercise contributes directly to a person’s physical fitness。许多专家指出体育锻炼直接有利于身体健康。
5. In view of the seriousness of this problem, effective measures should be taken before things get worse. 考虑到问题的严重性，在事态进一步恶化之前必须采取有效的措施。
6. Proper measures must be taken to limit the number of foreign tourists and great efforts should be made to protect local environment from the harmful effects of international tourism. 应该采取适当的措施限制外国旅游者的数量，努力保护当地环境不受国际旅游业的不利影响。
7. Many city residents complain that there are so few buses in their city that they have to spend much more time waiting for a bus, which is usually crowded with a large number of passengers. 许多市民抱怨城市的公交车太少，以至于他们花很长时间等来的却是一辆已经载满乘客的公交车。
8. There is no denying the fact that air pollution is an extremely serious problem: the city authorities should take strong measures to deal with it. 不可否认，空气污染是一个极其严重的问题：市政部门应该采取有力措施来解决。
9. An investigation shows that women tend to have a favorable attitude toward retirement. 一项调查显示妇女对退休持赞成态度。
10. A proper part-time job does not occupy students’ too much time. In fact, it is unhealthy for them to spend all of their time on study. As an old saying goes：“All work and no play makes Jack a dull boy。” 一份适当的兼职工作并不会占用学生太多的时间。事实上，把全部的时间都用到学习上并不利于学生的健康。俗话说得好：“只工作不玩耍，聪明孩子也变傻。”
