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 .