why didn't 可以改成why not

why didn't 可以改成why not why not,why didn't,why couldn't的区别 why didn't why not可以=why don't you why did he not have breakfast?与why didn’t he have breakfast? why did you not work 和why didn't you work意思一样吗 why don't和why not Why don't you+...why not +. Can you tell me why you did not come 可以改成Can you tell me why why don't you可以等于why not.那why doesn't he可以等于吗?为什么! "why didn't you write to me?" jane asked 改成间接引语 why don't we =why not 还是why don't you=why not