表示原因
There are three reasons for this.
The reasons for this are as follows.
The reason for this is obvious.
The reason for this is not far to seek.
The reason for this is that...
We have good reason to believe that...
表示好处
It has the following advantages.
It does us a lot of good.
It benefits us quite a lot.
It is beneficial to us.
It is of great benefit to us.
表示坏处
It has more disadvantages than advantages.
It does us much harm.
It is harmful to us.
提出建议
It is high time that we put an end to the trend.
There is no doubt that enough concern must be paid to the problem of...
Obviously, if we want to do something, it is essential that...
Only in this way can we...
Spare no effort to...
预示后果
Obviously, if we don't control the problem, the chances are that... will lead us in danger.
No doubt, unless we take effective measures, it is very likely that...
It is urgent that immediate measures should be taken to stop the...
表示对比
On the one hand, ... On the other hand, ...
Although both sides of the argument have their strong points, I personally agree with the former view.
引用名言
As the proverb says, ...
It goes without saying that...
There is an old saying that...
其他常用句型
It is quite clear that...
It is often said that...
Many people often ask such questions: "..."
这些句型可以帮助您在六级作文中快速构建清晰、连贯的论述，提高作文的整体得分。建议您在平时的学习中多积累这些句型，并在写作中灵活运用。