1、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....

　　2、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 .....

　　3、后果影响：分析某事物可能造成的后果或者带来的影响

　　[1].It will produce a profound impact on....

　　[2].In involves some serious consequence for........

　　4、两者比较：比较两事物, 要说出其一超过另一个, 或肯定一事物的优点, 也肯定其缺点的时候用

　　[1].The advantages gained from A are much greater than the advantages we gain from B.

　　[2].Indeed, A carries much weight重要度)when compared with B.

　　[3].There is no doubt that it has its negative effects as well as positive effects.

　　5、两者相同/相似：比较两事物共同都有或者共同都没有的特点时用

　　[1].A and B have several thing in common. They are similar in that.....

　　[2].A bears some striking(显著的) resemblance(s)(相似性)to B.