"Why didn't you'和Why don't you什么区别?

"Why didn't you'和Why don't you什么区别?
"Why didn't you'和Why don't you什么区别?

"Why didn't you'和Why don't you什么区别?
Why didn't you
指的是:你过去为什么不...
(但是那件事情已经过去,也已经是按那种说话人不希望的方式做了,有种惋惜,埋怨的感觉.)
说话的情景:你怎么不那么做,而要这么做啊,看吧..现在看你怎么办...
Why don't you
指的是:你现在为什么不...
(这有给对方建议的感觉)
说话的情景:你应该可以这样,你为什么不这样呢?你如果这样,听我的,应该不会错的
自己想的

过去时 和 现在时
形式上以说话人想要表述的具体状态而定.

Why didn't you tell me the troth?
你为什么没跟我说实话?(过去时)
Why didn't you catch the last bus as I told you to?:
你怎么不听我的话赶乘末班公共汽车呢?(过去时)
Why don't you...?(表示建议)
你为什么不...呢？
Why don't y...

全部展开

Why didn't you tell me the troth?
你为什么没跟我说实话?(过去时)
Why didn't you catch the last bus as I told you to?:
你怎么不听我的话赶乘末班公共汽车呢?(过去时)
Why don't you...?(表示建议)
你为什么不...呢？
Why don't you give him up?
你怎麽不和他一刀两断呢?(现在时)
Why don't you let me help?:
你干吗不让我帮忙呢?(现在时)

收起

一个是过去时,另一个是现在时啊

一个是现在时，一个是过去时