苯乙烯丙烯酸乳液:Unit?3?What?were?you?doing?when?the?UFO?arriv...

Unit 3 What were you doing when the UFO arrived?　　

语法讲义　　

一)教学目标　　

1、学习过去进行时态。　　

2、学习when, while引导的时间状语从句。　　

3、重点句型:　　

a.What were you doing when the UFO arrived ?　　

b.I was sitting in the barber's chair.　　

c.While he was buying a souvenir,a girl called the police.　　

二)重难点讲解:　　

1、What were you doing when the UFO arrived? I was standing in front of the library.　　

(1)were doing/was standing过去进行时　　

过去进行时表示过去的某一时刻或某一段时间中正在进行的动作。通常用于含有this time yesterday,at that time, at 8 o'clock yesterday morning, when the teacher came in等时间状语的句子中。　　

※过去进行时的构成:动词be的过去式was /were+动词的现在分词构成。　　

※过去进行时的用法:表示在过去某一时间内正在进行的动作。　　

e.g. I was watching TV at th at time.那时我正在看电视。　　

He was cooking at 12o'clock yesterday.昨天12点时他正在做饭。　　

When I came in,she was writing a letter.我进来时她正在写信。　　

※过去进行时还可以用来表示在过去某阶段正在进行的动作或存在的状态。　　

e..g They were waiting for you yesterday.昨天他们在等你。　　

He was studying in a middle school at that time.那时他在中学念书。　　

※过去进行时的否定式是在动词be后加not构成。　　

e.g. He wasn't watching TV when his mother came back.　　

(2)in front of在……前面(表示一个物体在另一物体前面)　　

e.g. When I came in,he was standingin front of the blackboard.　　

Sam sits in front of  me.　　

※注意in front of与in the front of 的区别:　　

in the front of表示"在……内的前面"　　

e.g. There is a teacher's desk in the front of the classroom.在教室(里的)前面有一个讲台。　　

There is a tall tree in front of the classroom.教室(外的)前面有一棵树。　　

He is standing in front of the car.他站在车前。　　

He is sitting in the front of the car.他坐在车的前部。　　

2、I was in my barber shop.我在理发店里。在理发店里也可以用in the barber's.　　

用名词的所有格可以表示"在……家里"或"在……店铺"。　　

in the doctor's =in the doctor's office in Mr Black's =in Mr Black's house　　

3、A UFO landed onCentre Street.　　

(1)"在……街上"可以用in the street(英)也可以用on the street　　

e.g. Our house is in /on this street.Don't play in /on the street.　　

(2)land(飞机等)着陆,降落,(人)上岸　　

e.g. The plane landed one hour late.　　

The space ship landed safely this morning.※land的反义词是take off"起飞"　　

4、The girl was shopping when saw the alien get out.　　

(1)when与while的区别when=at that time"当……的时候"其动作可以是延续性动作,也可以是瞬间的动作。　　

e.g. When I came in,he was reading.When I was a child,I liked soccer very much.　　

While=during the time that…"在……期间"　　

与其连用的动词通常是延续性的动词,不与瞬间的动词连用。(其引导的从句通常用过去进行时)　　

e.g. While her children were doing their homework, she was doing some housework.当她的孩子们在做作业时,她在做家务活。　　

e.g. While the students were reading the new words,the teacher walked around in the classroom.学生们在读生词时,老师在教室里走动。　　

(2)saw the alien get out 看到外星人出来 see sb do sth与see sb doing sth　　

see sb do sth强调"看见整个过程"see sb doing sth强调"看见某个动作或事件正在进行"　　

e.g. I saw him cross the street.我看到他过街。　　

I saw him playing over there.我看到他正在那边玩耍。　　

5、It around ten o'clock in the morning,I was walking down the street when the UFO landed right in front of me.上午10点左右,我正在街上走,就在这时不明飞行物正好降落在我前面。　　

(1)around=about e.g. She is around/about 20.她大约20岁。　　

(2)when=just at that time, and then就在这时候;就在此时　　

e.g. I was about to go out, when the telephone rang.我正要外出,就在这时电话响了。(在这种用法里when前通常有逗号)　　

(3)right adv.正好,恰恰,就　　

e.g. The stone hit him right on the nose.　　

6、You're kidding!你在骗人!kid v.哄骗,取笑,开玩笑　　

e.g. You are going to American tomorrow?Are you kidding?你明天要去美国?你开玩笑吧?　　

7、He 's scared.(1)be scared(某人)给吓坏了,害怕了=be afraid,be frightened　　

e.g. I am scared.(2)be scaredof /at sth　　

e.g. Are you scared of snakes?a scared child　　

(3)be scared to do sth.e.g. She was scared to swim alone.　　

8、While Linda was buying a newspaper at the train station,the dog got out of his box and ran away.　　

run away"跑开,逃走,迅速离开"　　

e.g. When the policemen came,the thief had run away. 　　

Stand here and wait. Don't run away.　　

9、When Linda shouted his name,Some people looked at her but Davy didn't come.　　

shout v."大喊,呼叫"指为了使人听见或引起注意而提高声音"呼喊,喊叫"。　　

可以表达人的喜、乐、哀、乐等感情。　　

e.g. She shouted out for help,but no one came."Be quiet!"She shouted.　　

I heard someone shouting my name.shout to sb对某人喊叫　　

e.g. We shouted to her to be careful.我们大声叫她小心。　　

shout at sb对某人喊叫(有斥责之意)　　

e.g. Don't shout at me. It's not my faulse.　　

10、She didn't think about looking outside the station. think about"就……思考,考虑"　　

e.g. I'm thinking about something else. Are you still thinking about buying a new house?　　

e.g. She is thinking about a new plan.　　

三)单元小结在本单元中我们学习了一种新的时态:过去进行时态。　　

还学习了when和while引导的时间状语从句。同时我们还学习了一些重要的单词、词组及句型。