when did you bring it to us前面did后面为何不变成brought过去式

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whendidyoubringittous前面did后面为何不变成brought过去式whendidyoubringittous前面did后面为何不变成brought过去式whendidyoubrin

when did you bring it to us前面did后面为何不变成brought过去式
when did you bring it to us
前面did后面为何不变成brought过去式

when did you bring it to us前面did后面为何不变成brought过去式
一般疑问句：在句首加did,句子中的动词过去式变回原形.如：Did Jim go home yesterday?特殊疑问句：⑴疑问词+did+主语+动词原形?如：What did Jim do yesterday?⑵疑问词当主语时：疑问词+动词过去式?如：Who went to home yesterday?
还有比如does也是一样的

因为已经有了did，所以后面用原型。

你这个是疑问句

因为前边变了,后边就不需要了.
是规定.

从你例出的句子，显然是个疑问句....我只能说这是英语的固定形式。疑问句中，为了保证句子的形式，英语不将动词提前，而用do（does，did）代替。后面的动词用原型。
Do you understand?
Did you understand?

Did you bring when did you bring it to us前面did后面为何不变成brought过去式 when did you bring it to us为什么用did 不用were?when were you brought it to us when you bring to car your did the garage连词成句 When did you leave? When did you coneback? when did you live in I'm afraid out. where did you go when I am upset I don't get your postcard.When did you ____it? what did you bring him是什么意思 Did not bring you happiness翻译中文? Did you bring b_ anything from Dalian? Bring you up when you're feeling when did you bring it to us这句话不是一般过去时吗?那为什么bring不变成brought.就是变过去式 A:You forgot your purse when you went out.B:Good heavens,( ).A.so did I B.so I did C.I did so D.I so did A:when did you see Jack?B:I saw him when I ( ) off the train (get) I ___ tell you to bring your homework but you still forgot.A.did B.does C.do D.am 求翻译：When did you send it?WHen i supposed received it?Happy to received it,