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……