引用：
One of the greatest early writers said …
“Knowledge is power”, such is the remard of …
“……”. That is how sb comment ( criticize/ praise…).
“……”. How often we hear such words like there.
讲故事
（先说故事主体），this story is not rare.
…, such delimma we often meet in daily life.
…, the story still has a realistic significance.
提出原因：
There are many reasons for …
Why …. , for one thing,…
The answer to this problem involves many factors.
Any discussion about this problem would inevitably involves …
The first reason can be obiviously seen.
Most people would agree that…
Some people may neglect that in fact …
Others suggest that…
Part of the explanation is …
进行对比：
The advantages for A for outweigh the disadvantages of…
Although A enjoys a distinct advantage …
Indeed , A carries much weight than B when sth is concerned.
A maybe … , but it suffers from the disadvantage that…
承上启下：
To understand the truth of …, it is also important to see…
A study of … will make this point clear
让步：
Certainly, B has its own advantages, such as…
I do not deny that A has its own merits.
结尾：
>From what has been discussed above, we may safely draw
the conclusion that …
In summary, it is wiser …
In short…