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1、What were you doing when the UFO arrived?,Unit 3,in front of 与in(at)the front of,in front of 在的前面（表示“有距离的前面”，在一个参照物的前面）eg.There is a car in front of the house.房子前面有一辆车 in(at)the front of 在的前头，前排（列）（在一个范围内的前面部位）eg.She sat in the front of the bus.她坐在公交车的前排,get out of 与get into 是反义词,get into走进，进入 eg.He
2、 get out of the car and get into the building,be amazing与be amazed,be amazing 令人惊奇的（修饰事物的，指某事令人惊奇，比surprising更具意外性 eg.She has an amazing talent for music.她在音乐方面有惊人的才华。Isnt that amazing.那不很令人意外吗？be amazed(at sth./to do/that 从句)（某人）对(因而)大感惊讶(指人作主语)eg.We were amazed at the news.=We were amazed to hear
3、the news.我们对这个消息感到非常惊讶.,in a tree与 on a tree,in a tree eg.Are there any birds in the tree?树上有些鸟吗？on a tree 在树上（指长在树上的东西）eg.Look!There are many apples on the tree.,Grammar,过去进行时,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 waitin
4、g 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(wasnt)/were not(werent)+V-ing疑问形式：Was/Were+主语+V-ing,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(last night/Sunday)，when sb.did sth等时间状语从句，,
5、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。,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。,2.when后通常用表示短暂性动词，while后通常用表示持续性动词，因此它所引导的状语从句中，谓语动词常用进行时态，,
6、When the car exploded I was walking past it.=While I was walking past the car it exploded.,3.when用作并列连词时，主句常用进行时态，从句则用一般过去时，表示主句动作发生的过程中，另一个意想不到的动作发生了。,I was walking in the street when someone called me.我正在街上走时突然有人喊我。,4.when作并列连词，表示“（这时）突然”之意时，第一个并列分句用过去进行时，when引导的并列分句用一般过去时。,I was taking a walk when I met him.我正在散步，突然遇见了他。We were playing outside when it began to rain.我们正在外边玩，这时下起雨来了。,
