1.段內(nèi)并列

分析某事物時，用此句型說明其主要原因或者多方面原因

例如：Why…? For one thing …For another …There are many reasons for this problem. First /For one thing …Second / For another …Third/ Still another …

2.段內(nèi)延伸

例如：In involves some serious consequence for …

3.段內(nèi)對比

(1)肯定其中一個

The benefits gained from B are much greater than that of A.

(2)二者有共同點

A and B have several things in common .They are similar in that…