5. 用介词短语开头，表示句子谓语动词发生的时间、地点、方式、原因、条件等：
On seeing him approach, the girl immediately turned her face to a shop window pretending to look at something there.( 时间)
Around the corner, a crowd gathered.( 地点)
Unlike his father, Peter touches neither cigarettes nor alcohol.( 方式)
Due to the limit of seats, he was not accepted.( 原因)
In case of fire, use the stairways.( 条件)
6. 动词不定式开头，强调谓语动词动作的目的：
To celebrate the arrival of the Millennium, we held a grand party in the hotel.
To show my trust om him, I deposited $ 10,000 into his bank account.
7. 用独立分词短语开头，使句子有正式的味道：
Birds singing in the tree, another routine day starts.
Sea gulls flying over the water, the old fisherman flung his fishing meat into the open sea.
A dog following them, the police searched every suspect.
8. 用过渡句开头，表示此句与上下句的关系：
Consequently, I slowed down to avoid a fine ticket.
In fact, she was a kindhearted woman.
9. 用同位语开头，表示主句位于动词发生的时间、地点、原因、方式、条件等：
A signing officer of the bank, Jane signs her name hundreds of times each day at work.
A TV addict, Jim watches TV movies one after another every evening until after midnight.
10. 用副词从句开头，表示主句谓语动词发生的时间、地点、原因、方式、条件等：
When you are in need of help, give me a call.
Wherever you go, I follow.
Since your childen love hamburgers and fries, we might as well eat in MacDonald.
As if it were summer,everybody wear shorts and a T-shirt.
In case that you get lost, call me at this number.
11. 用名词从句开头，作整句的主语：
Whether you take the position or not makes great difference to me.
Why I am unhappy is something I can’t explain.
What they should do about the hole in the roof is their most pressing problem.
以下是托福短文写作中使用率最高、覆盖面最广的基本句式，每组句式的功能相同或相似，考生可根据自己的情况选择其中的1-2个，做到能够熟练正确地仿写或套用。
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,people’s 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 pidesinto 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 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： 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.
