1. It’s adj for sb to do 做…对某人来说是…
2. … so … that … 如此… 以至于…
… too … to do 太… 而不能…
such … that … 如此… 以至于…
3. not…until… 直到…才…
例： I didn’t go to bed until my mother came back.
4.The reason why + 句子 is that + 句子 … 的原因是…
例：The reason why he got angry was that she told him a lie. 他生气的原因是她对他说了谎。
5. That is why + 句子 那是…的原因
6. That is because + 句子 那是因为…
7. It is said that + 句子 据说…
It is reported that + 句子 据报道…
8. There is no doubt that + 句子 毫无疑问…
9. It goes without saying that + 句子 不言而喻/毫无疑问...
10. There is no need to do没必要做…
11. There is no point in doing 做某事毫无意义
12. You had better (not) do... 最好(不)做
13. How about / what about doing …怎么样?
14. I think you should do 我认为你应该…
15. I suggest that you （should） do 我建议你做…
16. If I were you, I would do…我要是你的话，我会做…
17. It’s best to do 最好做…
18. Why not do / why don’t you do…? 为什么不