1、In my opinion, ...
2、From my perspective, ...
3、It is widely believed that ...
4、According to the research ...
5、Nowadays, ...
6、It goes without saying that ...
7、On the one hand, ...
8、On the other hand, ...
9、To sum up, ...
10、In conclusion, ...
11、As a result, ...
12、Furthermore, ...
13、Moreover, ...
14、Nevertheless, ...
15、Additionally, ...