## 否定句 ### 功能 说不 ### 构成 在be动词后面加上not,否定句的核心就是not. ``` is not am not are not ``` ### 例句 is am are 的选择是根据主语来的. ``` This is my name. This is not my name. ``` ``` i am not teacher. ``` ``` they are not my books. ``` ### 缩略形式 在口语中使用的是最多的. 读音也会发生变化. 有的音被去掉了或者改变读音. 在书面中也可以缩写,除非是非常正式的文件. ``` is not = isn't //t的读音经常被省略 ``` ``` am not = 'm not ``` ``` are not = aren't ```