This may explain why ____________/As a consequence____________
　　It goes without saying that____________
　　In fact, we can observe easily that in modern society,____________
　　As a proverb says, "Everything has two sides".
　　As a proverb says, "Where there is a will there is a way".
　　As is known to all, "No pains, no gains."
　　Let’s bring our discussion here to a more present and practical context. In today’s world,____________
　　I can say that if you have no experiences like these, your life is an inadequate one.
　　be of great benefit/damage to sb./sth.
　　The reason of ____________ is not so much ____________ as ____________
　  People differ greatly in their attitudes towards this problem. Some people hold the opinion that ____________ Others, [ however/on the contrary], maintain that ____________.
　　It is [urgent/necessary/convenient/desirable/advisable] for sb. to do sth.
　　have [trouble/a difficult time] [in doing sth./with sth.]
举例证：It can be given by a (well known/concrete) example that ____________. / In order to see this point clearly, let us to see an example:____________/To illustrate this, there is an example that is very persuasive:____________.

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.
PETS论说文模板简化版
　　(一) 对立观点式

　　1.一个事物对立的两个放面/两对立事物,要求考生支持一方并进行说明. (which类型)

　　(Who/how/what ……) is a prevalent topic undergoing serious debate. There exist two obvious and definite opinions regarding this controversy: A and B. personally, I would like to vote for A for three reasons.

　　The main reason for my propensity for A is that……

　　What is also worth noticing fact is that……

　　A is superior in another way, this is…

　　It is undeniable that B has its own merits. However, B can only be achieved conditionally because…joozone.com