be 动词在后面加not
I am happy. ——> I am not happy.
be 动词的否定形式有些可以缩写：
| 否定 | 否定缩写 |
|---|---|
| is not | isn't |
| are not | aren't |
| was not | wasn't |
| were not | weren't |
助动词在后面加not
I will call you. ——> I will not call you.
助动词的否定形式也可以缩写，基本都是加 n't 形成的：
| 否定 | 否定缩写 |
|---|---|
| will not | won't |
| would not | wouldn't |
| can not | can't |
| could not | couldn't |
| have not | haven't |
| has not | hasn't |
| had not | hadn't |
| should not | shouldn't |
一般动词在之前加do not
I like you. ——> I do not like you.
do not 根据时态的不同分为三种形式：
| 否定 | 否定缩写 |
|---|---|
| do not | don't |
| did not | doesn't |
| does not | didn't |
其他否定词
还有一些否定词可以表示否定：
no / nobody / nothing / neither / none / never
