一．定语从句
1. As is known to us , 众所周知……
2. What is known to us is that众所周知……
3. The reason why… is that…某人做某事的原因是因为
4. As is often the case，通常情况下……
5. As an old saying goes, 俗话说得好……
6.As sb put it,正如某人所说
二．状语从句
1.When it comes to sb/sth , 一谈到/当提到
2.As far as I am concerned,就我个人而言
3.Where there is a will, there is a way.有志者事竟成
4. From my point of view, it would be better if...在我看来……也许更好
5. As the modern society develops/advances, 随着现代社会的发展/进步
6. The+比较级…，the +比较级 越…就越…
三．名词性从句
1. There's no denying the fact that...毫无疑问，无可否认……
There is no doubt that ……
2. Nothing is more important than the fact that... 没有什么比这更重要……
3. It goes without saying that... 不言而喻……
4. What calls for special attention is that...需要特别注意的是……
5. It can be said with certainty that... 可以肯定地说……
6. It has to be noticed that... 必须注意到的是……
7.Therefore, we have the reason to believe that...因此，我们有理由相信……
8. It is commonly/generally/widely/universally believed /held/accepted/recognized that…通常/普遍认为……
9. I am firmly convinced that …我相信
10. What impresses me most is that…给我印象最深的是
11. What I want to stress is that…我想强调的是
12. I would appreciate it if you could do me a favor to do如果……我将不甚感激