为什么是we were having breakfast, 而不是we are eatting breakfast.

为什么是we were having breakfast, 而不是we are eatting breakfast. Having been shown around the library,we were taken to see the lab.为什么是“Having been shown”而不是“To show”,做目的状语不可以吗 the news that we were having a holiday tomorrow is true 句中为什么是were在语法书上看到这个句子翻译为我们明天放假的消息是真的.为什么用were? 有关when 和while题 如下____ we were having a good time,an accident happened.为什么是while 而不是when He was still working on his project while other people were having a rest 为什么是were having From the dates ____ on the plates, we decided that they were made in Song Dya、having been marked b、 was marked c、marked d、 had marked请问为什么不是A?为什么是C?就因为having been done一般不作定语？ 【非谓语】求语法讲解.We were greatly encourage by the news of our team（ ）another gold medal.A.to have wonD.having won为什么是having won?不是have won?伴随状么? 绝望主妇第一季第二集里有一句：should I have told her we were having steak .这句的词态解释?我应该告诉她我们会吃牛肉吗?为什么是 were having..如果是进行时表示未来,为什么不是are having 呢 ( )we were having breakfast,he came in.A.while B.when C.after 选哪个?为什么? The students in Class One were having a P.E class()we were having a math class.A.when B.while C.asD,since we were having a meeting.The lights () A.went ofwe were having a meeting.The lights () A.went off B.put off C.got off D.fell off They _____ supper when we _____ into the room.A. are having…went B. were having…go C. were having…went D. are having…go为什么不选D We ________ an English contest this time yesterday.A.had B.were having C.are having D.will have 选B,请问为什么不能选A? we were surpised when we saw the factory,we had imagined it _much bigger A having been B to be C be D being答案是B have big dinner 和have a big dinner区别?Dad came home when we finished ( ) big dinner A . having B had . C eat D having a . 答案为什么是A求解! We were greatly encouraged by the news of our team__anther gold medal.A.won B.having won 为什么A不行, We left the meeting there abviously __ no point in staying.A.were B.being C.to be D.having We were _when he called for me this morning.选填A.at the brakfast B.having a breakfast C.at breakfast D.having the breakfast