1、As is known to all, it is important to be/do …
众所周知，重要的是……
2、I think there are at least two reasons for …
我认为至少有两个原因……
3、For one thing,… For another ， …
其中之一，另一个是……
4、Let’s take … for example …
我们以……为例……
5、From what I have mentioned above we can see that without … we cannot …
从上述我提到的`可以看出如果缺少……我们就不能……
6、It is clear that,… plays an important part in …
很明显，……在……方面起着重要作用。
7、It is because … that …
因为……
8、Different people, however ， have different opinions on this matter 。Some people think that …
但是，不同人对待这个事情上有不同的看法。有些人认为……
9、Others argue that …
另一些人认为……
10、According to them, all of us should …
按照上述内容，我们全部都应当……
11、In their opinion, nobody can … without…
他们认为，如果没有……没有人可以……
12、Compared with …， … has a lot of advantages over …
与……相比，……比……有很多优势。
13、There is no doubt that …
毫无疑问
14、In short (In brief /In a word)， I firmly support the view that …
简而言之（简要的说/一句话），我坚定地支持……的观点。
15、So my conclusion is that …
所以，我的结论是……
（1） 不同观点列举型（ 选择型 ）
There is a widespread concern over the issue that __作文题目_____. But it is well known that the opinion concerning this hot topic varies from person to person. A majority of people think that _ 观点一________. In their views there are 2 factors contributing to this attitude as follows： in the first place， ___原因一_______.Furthermore， in the second place， ___原因二_____. So it goes without saying that ___观点一_____.
People， however， differ in their opinions on this matter. Some people hold the idea that ___观点二_______. In their point of view， on the one hand， ___原因一_______. On the other hand， ____原因二_____. Therefore， there is no doubt that ___观点二______.
As far as I am concerned， I firmly support the view that __观点一或二______. It is not only because ________， but also because _________. The more _______， the more ________.
（2）利弊型的议论文
Nowadays， there is a widespread concern over (the issue that)___作文题目______. In fact， there are both advantages and disadvantages in __题目议题_____. Generally speaking， it is widely believed there are several positive aspects as follows. Firstly， ___优点一______. And secondly ___优点二_____.
Just As a popular saying goes， “every coin has two sides”， __讨论议题______ is no exception， and in another word， it still has negative aspects. To begin with， ___缺点一______. In addition， ____缺点二______.
To sum up， we should try to bring the advantages of __讨论议题____ into full play， and reduce the disadvantages to the minimum at the same time. In that case， we will definitely make a better use of the ____讨论议题___.
as is shown/indicated/illustrated by the figure/percentage in the table(graph/picture/pie/chart)， ___作文题目的议题_____ has been on rise/ decrease (goesup/increases/drops/decreases)，significantly/dramatically/steadily rising/decreasing from______ in _______ to ______ in _____. From the sharp/marked decline/ rise in the chart， iit goes without saying that ________.
There are at least two good reasons accountiing for ______. On the one hand， ________. On the other hand， _______ is due to the fact that ________. In addition， ________ is responsible for _______. Maybe there are some other reasons to show ________. But it is generally believed that the above mentioned reasons are commonly convincing.
As far as I am concerned， I hold the point of view that _______. I am sure my opinion is both sound and well-grounded.