请问：这两种说法有什么区别?一个是Whydon'tyoudosth.一个是Whydoyounottodosth.还有Howcouldyounottodo和Howcouldn'tyoudo

Question

请问：这两种说法有什么区别?
一个是Why don't you do sth.一个是Why do you not to do sth.
还有How could you not to do 和 How couldn't you do

Answer 1

1.Why do you not to do sth.表示建议=why not,含义是：你应该做……
比如,A：I suggest we go to cinema tonight
B:Why do we not go to cinema (等于 why not)
为什么不去呢（意思是,我们应该去）
而 Why don't you do sth.表示疑问,责问,你为什么不做……?
2.How could you not to do 表示埋怨的语气,你怎么能不做……呢
How couldn't you do 责问,语气较上句强烈