为什么用过去完成时?Maybe we haven't realized it,but the Internet(had changed)our life quietly but rapidly.我觉得应该用现在完成时,用has changed.

为什么用过去完成时?Maybe we haven't realized it,but the Internet(had changed)our life quietly but rapidly.我觉得应该用现在完成时,用has changed. What have you been doing since we last met?为什么用过去完成时 I met Tom yesterday.We hadn't seen each other since we left Sydney in 1990.这里为什么用过去完成时, We----[live] in London for two years and then ___[go] to edinburgh. 用过去完成时为什么要省略had Maybe we could celebrate tonight.—What did you have in mind?为什么句中的can和do用过去式 in order that the music industry can develop healthily,we had better ban free music downloads.这句话中的had为什么用过去完成时, we cooked the dumplings.we ate them up.用过去完成时连接两句. I saw Janson yesterday.We haven't seen each other since we left Beijing.这句话用现在完成时对吗?为什么这句话却用过去完成时I saw Li Lei yesterday.We hadn't seen each other since I left Beijing. 为什么主句用过去完成时,宾语从句用过去将来时 it was the first time 后面为什么要用过去完成时 I had known her long before. 为什么要用过去完成时? 跪求解析第七题,为什么用过去完成时? Maybe that's why we have seldom sat down and exchanged our feelings and thoughts.这句话为什么没错可以用have 关于过去完成时的句子He had completely ignored her remark ,preferring his own theory .这里为什么要用过去完成时啊 We have been friends with each other since he came to our school.主句为什么不用过去完成时 用过去完成时造句, 英语：什么时候用过去完成时? 判断什么时候用过去完成时