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以下这7个句型多用于解释原因或表达观点，在Part 1和Part 2中都很常用。
例句： Cities are getting crowded. This is because more and more people are leaving the countryside and moving to cities.
城市正在变得拥挤。这是因为有越来越多的人离开乡村，移居到城市。
Fast food is more and more popular. This is because it is not only convenient but cheap as well.
快餐越来越受欢迎了。这是因为快餐不仅方便，而且便宜。
详解： 这个句型用于解释原因。this指代前一个句子描述的情况或现象。
例句： The reason why I can’t be there is that I have to prepare for the competition next week.
我不能去那儿的原因是我得为下周的竞赛做准备。
The reason why the meeting is cancelled is that many people will not be available that day.
会议被取消的原因是那天很多人没空。
详解： 这个句型用于解释原因。句中含有由why和that引导的两个从句，属于难度较高的句型，如果能准确地运用到我们的作文中是非常加分的。此句型有一个只用that从句的简化版：The reason is that ... 原因是……
例句： The meeting is cancelled. The reason is that many people will not be available that day.
会议取消了，因为那天很多人没空。
例句： In my opinion, we should try our best to win this match.
在我看来，我们应该尽最大努力去赢得这场比赛。
In my opinion, it is important for students to do exercise every day.
在我看来，学生每天都做运动是很重要的。
详解： 这个句型用于发表自己的想法或提出建议。
近义句型： In my view, ... ；It seems to me that ... 依我所见，……
例句： In my view, it is better for us to finish this project together.
依我所见，我们一起来完成这个项目更好。
It seems to me that we should collect more materials for our magazine.
依我所见，我们应该为我们的杂志搜集更多的素材。
例句： I am convinced that we will win the match.
我认为我们能赢得这场比赛。
I am convinced that jogging can help to relieve pressure.
我认为慢跑有助于减压。
详解： I am convinced that ...和I think that ... 意思相近，只是前者更加书面化，多用于写作中。
例句： It is better for you to prepare the speech in advance.
对你来说，提前准备一下这次演讲内容会更好。
It is easy for me to communicate with foreign visitors in English.
对我来说，跟外国游客用英语交流很容易。
详解： 在这个句型中，it是形式主语，to do sth.是句子真正的主语。另外，is后需要使用形容词或形容词的比较级。
近义句型： It is ... to do sth. 做某事……
例句： It’s much easier to learn a foreign language by watching foreign films instead of reading textbooks only.
比起仅仅只是阅读课本，通过观看外国影片来学一门外语要容易得多。
It is fun to play games with you.
和你一起玩游戏很有趣。
例句： On the one hand, fast food is really convenient. On the other hand, it is bad for our health.
一方面，快餐真的很方便。（但是）另一方面，快餐不利于我们的健康。
On the one hand, students can relax their bodies and ease their minds by playing computer games. On the other hand, playing computer games too often may have a bad influence on their studies.
一方面，学生可以通过玩电脑游戏放松身心。（但是）另一方面，经常玩电脑游戏会对他们的学习产生不好的影响。
详解： 这个句型用于谈论一件事情的两个方面，这两个方面是对立关系。on the other hand相当于“however”，表示转折。
例句： For one thing, I am not available this weekend. For another, the cinema is too far from my home.
一方面，我这周末没空。另一方面，这个电影院离我家太远了。
For one thing, reading books is good for broadening students’ outlook on life. For another, reading helps to develop students’ thinking skills.
一方面，读书有助于开阔学生的眼界。另一方面阅读有助于发展学生的思维能力。
详解： 这个句型用于谈论一件事情的两个方面，这两个方面是并列关系。而“On the one hand, ... . On the other hand, ... .”这个句型谈论的则是一件事情的两个相反的方面。