这个为什么要用过去进行时I was just picking my nose,and now it's bleeding.我只是挖鼻子,然后就流血了.-----这句话为什么要用过去进行时?

i suddenly realized that the man was speaking to me这个句子为什么一定用过去进行时 这个为什么要用过去进行时I was just picking my nose,and now it's bleeding.我只是挖鼻子,然后就流血了.-----这句话为什么要用过去进行时? 过去进行时中的陈述句为什么I was 而不是用I were i suddenly realized that the teacher （was referring）to 为什么用过去进行时? When I was watching TV,my brother did his homework.主句为什么用过去时,而 不用过去进行时? 英语翻译great content was recovering 为什么用过去进行时? i was being 是过去完成进行时吗那它为什么不是过去被动进行时呢 i was wondering if you could tell me how to fill outthis form.这里前面为什么用过去进行时? I'm sorry my boy was acting up in your house yesterday.为什么这里 要用过去进行时 也不是 acted up? AS i was writing a letter ,Robert is came to visit me.为什么前面用过去进行时,后面用过去时 i was being tested for a driving licens for the third time首先分析第一个问题,这边的过去进行时的被动时态,为什么要用过去的 “进行时”?难道我用 I was tested .也可以表示过去的时态啊!第二个问题,什么 To her surprise,the necklace was missing.为什么用was missing?表示过去正在丢失吗?过去进行时? I was having trouble getting along with my parents这里 为什么 要用 过去进行时 而不是现在完成进行时 为什么?.要用过去进行时为什么?at that time he was working in the library要用过去进行时?还有什么情况吗?那有at that time 就一定用过去进行时吗？ as i was getting on the bus ,i slipped and hurt my foot 这句话为什么用过去进行时,get on是瞬间动词 一定要用过去进行时吗今天考试,写一篇作文,没说一定要过去进行时,但是我写的是 I was fly kite这个句子对还是错啊,求解啊.大概会扣几分啊. I asked her whether she was enjoying her dinner 为什么用was enjoying ,是过去进行时的时态么I asked her whether she was enjoying her dinner为什么用was enjoying ,是过去进行时的时态么还是 be enjoying sth 又是一个什么 划线句子为什么要用过去进行时?把was去掉,suffer和lead都改成过去式,可以吗