sure(ly)
1.下面两句意思不同：
- He is sure to live to ninety. （他一定会活到90岁。）
- He is sure of living to ninety. （他自信可以活到90岁。）
下面各句里的不定式不可改作of和动名词：
- It is sure to be fine this afternoon.
- This plan is sure to succeed.
- Such a book is sure to prove popular.
- Be sure to tell me the particulars.
也有人用be sure and ...而不用be sure to ...。例如：Be sure and remember what I told you. 和If you are ever in my part of the country, be sure and look me up.
2.I am not sure (about) where he lives等句子里的about用的少，不用的多。
3.关于sure和certain的不同，参见certain 3
4.关于sure（副词）和surely，有下面两点该注意：
（1）sure除了在as sure as和sure enough两种表达方式里以外，现在在英国可说是不用的。但在美国在口语里很普遍。例如：
- It sure was a cold night.
- A: Do you think she is French?
B: Sure!
在英国这两句里不用sure而用certainly。
（2）下面各句里的surely在英国作“谅必”或“当然”解，但在美国作“一定”解。在英国说“一定”用certainly或undoubtedly：
- You surely do not know him.
- It is surely the first time that these two men have met.
- You surely don't wish to be so cruel, do you?
- You can do something to help him, surely.
- Surely something can be done to help him.
- Surely you're not going alone.
- Surely this weather can't last much longer.
- Surely it will clear up before long.
5.make sure后面可以接以that引导的从句，那that往往省去。例如：They looked up and down the road to make sure (that) they were alone.
6.for sure＝for certain，作“毫无疑问地”解。例如：I can't say I know it for sure.
