did it work?do为什么要用过去式

did it work?do为什么要用过去式 为什么 过去做某事 用 what did you do不用 what did you did We try to do the work,but it doesn't____(A.do B.did C.work) long ____ take to finish the work tomorrow A.will it B.is it C.do it D.did it选择哪个 为什么 为什么要用did而不用do, it's high time that we did sth.这里为什么要用虚拟语气?it's time to do sth,这里为什么不用虚拟? Did i do it to make myself feel better?为什么有两个助动词did,do? how long did it __you to do the work?A.spend B take c give being Sunday today ,we do not have to work.为什么前面要改成it being How long () it () you to work out such a difficult problem?A.did…take B.does…take C.did…cost可是为什么不选A,应该要用一般过去时啊!还有个答句：About thirty minutes. Why did Franklin flew a kite?How did you help?What did you think about it all?What will he do next第一句是为什么他要放这个风筝……，用英语回答谢谢 你为什么这么做?翻译为why did you do?为什么这里要用did的,而不能用do? How much did the computer cost ben?这句话中为什么要用did不用do? 全部都要用学过的单词来写!_____ you work har ______?Yes,I did A Do,all day B Did,all day C Do,all the day D Did,all the dayIs that _____ interesting novel?Yes,but it is ______ difficult A an,a little B a,a bit C a,little D an,a few根据 he ___(do) the work this afternoon是用will do 还是 did 例句：1.Did Tom do his home work yesterday?When?回答：I want to know if Tom did his homework yesterday.请问回答中的为什么要过去式did而不用单数第三人称does? where did you do it? why did you do it