1. 部分否定
Not both of them are my brothers .
Both of them are not my brothers .
All is not gold that glitters .
2. 双重否定
双重否定分为三种:
肯定型:There are no roses without thorns .
强调型:I just can’t do nothing .
委婉型:I can’t hardly read your hand writing .
3. 几乎否定
She is barely right .
I seldom got any sleep last night .
Few people can understand why he did it .