摘要：第一点原因：The main/first reason is that ____________. First， we can observe easily that in modern society， …… In the first place To begin with， （a good roommate should ____________） 第二点原因： Besides， the fur

第一点原因：The main/first reason is that ____________.

First， we can observe easily that in modern society， ……

In the first place

To begin with， (a good roommate should ____________)

第二点原因：

Besides， the further reason why I advocate AAA is that ____________.

[The second/another] reason for [my/people‘s] propensity for A is that ____________

[The second/another] desirable quality for a good roommate is that ____________

第三点原因：

Moreover，____________

The third reason， [not the last/however]， goes this way： ____________

写完三条原因还可以再写：Maybe there are some other reasons( to show____________)。 But

it is generally believed that the reasons mentioned above are commonly acceptable.

最后意犹未尽或者字数不够可以加这么一句：

Nevertheless I must admit that people can do well without AAA， but no one can ignore the additional convenience and satisfaction offered by AAA. Such experience will definitely be helpful in one‘s later life.