摘要:过去进行时表示过去某一时刻或者某段时间正在进行或发生的动作.常和表过去的时间状语连用.如: I was doing my homework at this time yesterday.昨天的这个时候我正在做作业. They were waiting for you yesterday.他们昨天一直在等你. 过去进行时的构成: 肯定形式:主语+was/were+V-ing 否定形式:主语+was not /were not +V-ing 疑问形式:Was/Were+主语+V-ing. 基本用法:1.过去进行时表示过去某一段时间或某一时刻正在进行的动作.常与之连用的时间状语有.at that time/moment, (at) this time yesterday (last night/Sunday/week-), at+点钟+yesterday .when sb. did sth等时间状语从句.如: What were you doing at 7p.m. yesterday?昨天晚上七点你在干什么? I first met Mary three years ago. She was working at a radio shop at the time.我第一次遇到玛丽是在三年前.当时她在一家无线电商店工作. I was cooking when she knocked at the door.她敲门时我正在做饭.

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