今天辨析一下:why not、why don't
一、用法不同
1、why not:why not直接 do something。
2、why don't:why don’t 人称 do something。
二、句子结构不同
1、why not:why not可以独立成句。
2、why don't:why don't不可以独立成句。
三、时态不同
1、why not:why not没有时态的变化。
2、why don't:why don't结构可以有属时态的变化,例如变为过去why didn't。
—Why didn’t you come to my birthday party yesterday?—____________
A.Excuse me,my friend sent me a flower.
B.Fine,I never go to birthday parties.
C.Ha…ha,I don’t like birthday parties.
D.Sorry,but my wife had a car accident.
Key:D
why not : 意思为:为什么不?当然 ,在口语中也能代替Of Course
Eg:
A:Let's go shopping. 让我们一起去购物吧!
B:Why not? 当然了