1、引用法 ----- 先引出名人名言或者有代表性的看法, 来引出文章要展开论述的观点
[1]. "Knowledge is power." such is the remark made by Bacon.This remark has been shared by more and more people .
"Education is not complete with graduation.(学无止境)" Such is the opnion of a great American philosopher. Now more and more people share his opnion.
[2]."........." How often we hear such statements like thoses /this .
In our own days we are used to hearing such traditional complains as this "......"
2、基本原因：分析某事物时, 用此句型说明其基本的或者多方面的原因.
[1]. The answer to this problem invovles many factors. For one thing... For another...... Still another ...
[2]. A number of factors , both physical and psychological affect .... /both individual and social contribute to ....
3、另一原因：在分析了基本原因之后, 再补充一个次要的或者更重要时用!
[1]. Another important factor is ....
[2]. ... is also responsible for the change/problem.
[3]. Certainly , the ... is not the sole reason for .....
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