know
1.know作“认识(某人)”解,know of作“知道有(某人)”解。例如:I know of him, but do not know him (personally). 说“知道有…”必须用of。例如:Do you know of any such shop in your city? 但know the fact和know of the fact都可以说。
2.I am glad to learn that...等句子里通常用learn,不用know。
3.Who do you think he is? 等句子里该用think,不可用know。
4.have known后面接宾语和不定式的时候,那不定式可以有to,也可以没有to。例如:I have known him (to) say this before. never knew和have never known后面接宾语和不定式的时候,那不定式没有to,如I never knew him say this before和I have never known him say this before。假使have known,never knew或have never known改成被动语态,那不定式必须有to。例如:He has been known to say this before. He was never known to say this before. 和He has never been known to say this before.
假使have known,never knew或have never known的宾语后面的不定式是be,必须有to。例如:I have known him to be too busy to study. I never knew him to be too busy to study. 和I have never known him to be too busy to study.
5.注意下面第一句里用I know it,第二句里用I know:
- He is going to get married, and I know it.
- When his sister said that he was going to get married, I said, 'Yes, I know.'