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 arethree reasons for the changes that have taken place in our life.Firstly,peoplesliving standard has been greatly improved.Secondly,most people are wellpaid,and they can afford what they need or like.Last but not least,more andmore 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 arelike friends.They can help us know the world better,and they can open our mindsand 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,everythingdividesinto two.Television can also be harmful to us.It can do harm to ourhealth and make us lazy if we spend too much time watching televi- sion.

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： Computersare now being used everywhere,whether in the government,in schools or inbusiness.Soon,computers will be found in every home,too.We have good reason tosay that computers are playing an increasingly important role in our life andwe 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 housingproblem that we are confronted with is becoming more and moreserious.Therefore,we must take some effective measures to solve it.

在进行托福口语练习时，大家把上面的句式认真仔细的学习，达到熟练运用的程度，相信大家进行托福口语时，一定能考取好成绩。