1、As far as I am concerned, I believe that...
2、It goes without saying that...
3、It is widely acknowledged that...
4、It is commonly believed that...
5、There is no denying that...
6、There is no doubt that...
7、It is clear that...
8、It is universally accepted that...
9、It is widely recognized that...
10、It is a well-known fact that...
11、It is generally agreed that...