比较常见的有：
1.never 意为“从不”
例如：我不认识他.
I do not know him.
= I never know him.
2.hardly 意为“几乎不”
例如：我不这么认为.
I do not think so.
= I hardly think so.
3.neither 意为“两者都不”
例如：这两本书我都不喜欢.
I don't like these two books.
= I like neither of the books.
4.no 意为“没有”
例如：我没有孩子.
I do not have child.
=I have no child.
5.seldom 意为“很少”
例如：她不怎么笑.
She does not smile often.
=She seldom similes.
6.none 意为“一个人或物也没有”：
例如：我们不知道答案.
We do not know the answer.
=None of us know the answer.