1.段内并列
分析某事物时，用此句型说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.段内延伸
例如：In involves some serious consequence for …
3.段内对比
(1)肯定其中一个
The benefits gained from B are much greater than that of A.
(2)二者有共同点
A and B have several things in common .They are similar in that…
来源：作文地带整理
