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

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 英语翻译great content was recovering 为什么用过去进行时? 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 用过去进行时造5个句子有翻译句子结构：主+were/was+doing 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? 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？ 用过去进行时完成下列句子 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? 过去进行时中的陈述句为什么I was 而不是用I were He was wearing a shirt yesterday.为什么用过去进行时 i suddenly realized that the teacher （was referring）to 为什么用过去进行时? 这个句子为什么用过去时啊The house has never been rebuilt since it was burnt down.since后为什么要用过去时啊 英语句子改被动语态（高中）把这句改为被动： Mother was not mending the trousers.顺便请教一下,现在进行时主动该被动要怎样变化呢?还有过去完成时,过去进行时,一般将来时,过去完成时和将来 用现在进行时和过去进行时各写五个句子. 求过去进行时句子 while引导句子怎么判断Grandma was cooking breadfast while I was washing my face this morning.中的过去进行时was cooking 可不可以换过去时cooked 为什么? 用过去进行时造十个句子!急 比如：I was,You were,He was ,It was,We were They were ,You were..造十个, 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?