本文中介绍了5种最实用最基础的句型，可以用在托福写作中，增加句子结构的变化。
1、表示原因
1)There are three reasons for this.
2)The reasons for this are as follows.
3)The reason for this is obvious.
4)The reason for this is not far to seek.
5)The reason for this is that...
例如：There are three reasons for the changes that have taken place in our life. Firstly, peoples living standard has been greatly improved. Secondly, most people are well paid, and they can afford what they need or like. Last but not least, more and more people prefer to enjoy modern life.
2、表示好处
1)It has the following advantages.
2)It does us a lot of good.
3)It benefits us quite a lot.
4)It is beneficial to us.
5)It is of great benefit to us.
例如：Books are like friends. They can help us know the world better, and they can open our minds and widen our horizons. Therefore, reading extensively is of great benefit to us.
3、表示坏处
1)It has more disadvantages than advantages.
2)It does us much harm.
3)It is harmful to us.
例如：However, everything divides into two. Television can also be harmful to us. It can do harm to our health and make us lazy if we spend too much time watching television.
4、表示重要、必要、困难、方便、可能
1)It is important (necessary, difficult, convenient, possible) for sb.to do sth.
2)We think it necessary to do sth.
3)It plays an important role in our life.
例如：Computers are now being used everywhere, whether in the government, in schools or in business. Soon, computers will be found in every home, too. We have good reason to say that computers are playing an increasingly important role in our life and we have stepped into the Computer Age.
5、表示措施
1)We should take some effective measures.
2)We should try our best to overcome (conquer) the difficulties.
3)We should do our utmost in doing sth.
4)We should solve the problems that we are confronted (faced) with.
例如：The housing problem that we are confronted with is becoming more and more serious. Therefore, we must take some effective measures to solve it.
好的句子结构可以使文章看起来更漂亮更有逻辑，托福写作中需要运用句子结构的变化来体现写作水平并能使文章更富含多样性。同学们要仔细学习以上5种句型并且做到融会贯通，运用到实际的写作当中。
