请问didn't did don't not或者还有什么的,是怎么个用法比如why didn't you say goodbye 和why don't you say good bye一样吗?都可以这么用吗?谢谢!

请问didn't did don't not或者还有什么的,是怎么个用法比如why didn't you say goodbye 和why don't you say good bye一样吗?都可以这么用吗?谢谢! I don't think he did well in the exam.这里的don't 要改成didn't I don't think they knew about it,did they?我认为应该是didn‘t theyI don’t believe she told a lie，didn’t she？ I told you not to be late again,John,__I?A.do B.did C.don't D.didn't.前面有 not 为什么不用 didn’t.A.do B.did C.don't D.didn't 请详细说明. Did you see a friend?No,I_______A.don't B.did c.didn't选择A B C中的一个 Don't you didn't marry in Why she didin't come to the party last night.I don't know shy she didn't.I don't know shy she did.哪一个对为什么 -did you do your homework yesterday?--( )A,yes,i didn't B,no,i don't C,no,i didn't 请问I don't believe what you did.能不能改写成I don't believe you did? 请问I don't believe that you did it 能不能改写成I don't believe you did they went to the cinema ,____?A.didn't they B.do they C.did they D.don't they did后面的动词要加过去式吗,那didn't呢还有don't呢,要加过去式吗 I told you not to be late again,John,________ A.do B.did C.don't D.didn't I told you not to be late again,John,__I?A,do B,did C,don't D,didn't I told you not to be late again,John,__I?A.do B.did C.don't D.didn't You felt unhappy yesterday,____?A.didn't you B.did you C.don't you D.do you .You seldom had time for writing,______?:did you B:didn't you C:do you D:don't you I don't think he stole the money,___?A.do I B.don't I C.did he D.didn't he