not until then后面为什么加过去式不是过去完成式?then的时态不是过去式嘛?过去的过去不应该用过去完成嘛?

not until then后面为什么加过去式不是过去完成式?then的时态不是过去式嘛?过去的过去不应该用过去完成嘛? 英语翻译加（not.until) it is not until的用法什么时候后面加that 什么时候加when? must后面能不能加not,为什么? not …until 的用方法,until后面加句子还是词语,这个句式和till又有什么区别, Not until 放在句首的倒装句 后面能加that吗 您好,请问 it was not until是什么样的句型啊,后面可以加什么啊, the children do not get home until 7 pm.中not前为什么加do? I couldn't say I didnot like something until after I tried it为什么要用after?not until句型什么时候until后面要用after I can not wait until then怎么翻译 The airport was built during the war,but for some reason it could not be used then.后面是不是then,为加它,不加行不行? Why not 后面为什么要加动词原形?急! then后面加动词什么形式 but then后面加动词什么形式 单三后面动词加s还是加ed例如：Then he makes his bed.这句话make后面为什么加s不加ed? It was__he came back from Africa that year__he met the girl he would like to marry.A: when then B: not until C: not until that D:only when应该选择哪个,为什么? not until和过去完成时过去完成时是加在not那边还是until后面新概念好像写了个I had not understood the problem until he explained it.但翻译是在他解释之前我不懂这个问题不是说not until是 直到……才吗 请问it was not until 加时间从句后面是只能加that when,while,in which ,before 什么的都不行?