Why don't you+...why not +.

问题描述:

Why don't you+...why not +.

是为什么不 的意思 多用于表建议
具体用法 :
Why don't 后加人称、谓语,Why not 后直接加动词.如:
Why don't you take a bus?
Why not take a bus?
初二就应该学了吧