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 inourlife。
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 harmfulto us。
例如：However,everything dividesinto two.Television can also
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。
这些句型都是各位托友熟悉的句型，大家只要反复造句，反复运用，很快就会运用自如了。在托福考试中，利用这些句式进行组合，就可以表达清楚观点，写出逻辑清晰有条理的托福作文了。
