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1、江苏新教材牛津英语八年级上Unit8NaturaldisastersGrammar一般过去时一般过去时1）过去发生的动作或存在的状态。）过去发生的动作或存在的状态。如如 I went to school on foot.2）刚发生过的动作。）刚发生过的动作。如如 She came in just now.现在进行时现在进行时 1）此刻正在进行的动作）此刻正在进行的动作 如如 We are having our English class now.2）此阶段正在进行的动作）此阶段正在进行的动作 如如 We are using a new text book.一般将来时一般将来时 如如 I am
2、going to/shall/will visit my uncle this weekend.l 过去进行时过去进行时 今早今早7:00我在吃早饭。我在吃早饭。I was eating breakfast at 7:00 this morning.昨晚昨晚8:00-10:00他在看电视。他在看电视。He was watching TV from 8:00 to 10:00 last night.Past continuous tense（过去进行时）过去进行时）Tom was playing football.She was reading a book.What was Tom doing
3、 just now?What was Lucy doing at 2:30 p.m.yesterday?They were watching TV from 6 to 8 last night.The twins were thinking.What were they doing from 6 to 8 last night?What were the twins doing at this time yesterday?过去进行时的句式过去进行时的句式（1 1）基本结构：）基本结构：was/were+v-ing（2 2）否定式：）否定式：was/were not+v-ing was not
4、=wasnt were not=werent（3 3）疑问句：）疑问句：将将 was/were 调到主语前调到主语前过去进行时的基本用法过去进行时的基本用法表示过去某一时刻正在进行的动作以及表示过去某一时刻正在进行的动作以及过去某一段时间内持续进行的动作过去某一段时间内持续进行的动作,常与常与表示过去的具体时间连用。表示过去的具体时间连用。如：如：at that time,at this time yesterday，at 9:00 last night,at that moment，from7 to 10 this morning，when I came in 等连用。等连用。一般过去时与过
5、去进行时的区分一般过去时与过去进行时的区分 He wrote a letter this morning.He was writing a letter this morning.区别区别:今天上午他写了一封信。今天上午他写了一封信。今天上午他一直写信。今天上午他一直写信。过去进行时与一般过去时的区别过去进行时与一般过去时的区别 过去进行时过去进行时着重描述当时正在进行的动作，着重描述当时正在进行的动作，它的特点是：未完成它的特点是：未完成,强调过程；强调过程；一般过去时一般过去时表示一个业已完成的动作，表表示一个业已完成的动作，表示动作发生过，而且已经结束了示动作发生过，而且已经结束了,强调
6、结强调结果。果。认识过去进行时句式认识过去进行时句式1)Jim was watching TV from eight to ten last night.2)Jim wasnt watching TV from eight to ten last night.3)-Was Jim watching TV from eight to ten last night?-Yes,he was./No,he wasnt.4)What was Jim doing from eight to ten last night?when,while 和as 的用法如如:昨晚当我到家的时候，妈妈和爸爸正在看昨晚当我
7、到家的时候，妈妈和爸爸正在看 电视。电视。My parents were watching TV when I arrived home last night.刚才当老师走进教室的时候，学生们正在读书。刚才当老师走进教室的时候，学生们正在读书。Students were reading when the teacher came in just now.有时为了句子表达的需要，我们可有时为了句子表达的需要，我们可以用复合句来表达过去进行时。以用复合句来表达过去进行时。when,while 和as 这三个词均有“当时候“的意思。如：There were fewer sandstorms when
8、 my grandparents were young.我祖父母年轻时沙尘暴要少些。While Millie was watching TV,her mum was sleeping.米莉在看电视时她妈妈在睡觉。I saw a traffic accident as I was riding to school this morning.今天早晨我骑车上学时看见一起交通事故。when 和 as 既可以指某一点时间，也可以指某一段时间，其从句谓语动词表示的动作既可以是瞬间性的，也可以是延续性的，while指一段时间，从句的谓语动词必须是延续性的。即：指一段时间时，when、while和as 都可
9、用；指一点时间时，只能用when 或as，不能用while。试比较：When/As he woke up,it was eight oclock.(/)While he woke up,it was eight oclock.(X)When/While/As I was waiting for a bus,I met her.(/)when 引导的从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as引导的从句的谓语动作必须是和主句谓语动作同时发生。When he finished his homework,he played the computer games for a
10、while.当他完成作业后，他玩了会儿电脑游戏。（finished先发生）When I got to the museum,the door was closed.当我赶到博物馆时，大门已经关上了。（got to 后发生）While/As I was sleeping,the telephone rang.当我睡觉时，电话响了。（was sleeping 和rang同时发生）当主句、从句动作同时发生且从句动作为延续性动词时，when、while和as 都可使用。When/While/As she was making a phone call,I was writing an email.当她
11、在打电话时，我正在写一封电子邮件。（make为延续性动词）When/while/As we were reading,a stranger came in.当我们正在看书时，一位陌生人走了进来。（read为延续性动词）强调两个动作同时进行，常用“过去进行时+while+过去进行时“结构。如：They were rowing boats while we were climbing the hill.当我们在爬山时，他们在划船。强调某个动作发生的时候，另一个动作正在进行，常用“一般过去时+while+过去进行时“结构。如：It began to rain heavily while we wer
12、e having dinner.我们在吃晚饭时，开始下起大雨。强调某个动作正在进行时，另一个动作突然发生，常用”过去进行时+when+一般过去时”结构。如：I was walking in the street when he called me.我正在街上走时，他突然喊我。当主句、从句动作同时进行，从句动作的时间概念淡化，而主要表示主句动作发生的背景或条件时，只能用as。这时，as有“随着”;“一边,一边“之意。As years go by,China is getting richer and stronger.随着时间一年一年过去，中国变得越来越富强了。The little girls
13、sang as they played.小姑娘们一边玩，一边唱。例题巩固：(1).We were swimming in the lake _ the rain started yesterday.A.when B.while C.until D.before (2).We are going to the post office._ youre there,can you get me some stamps?A.As B.While C.Because D.If(3).Babies sleep l6 to l8 hours in every 24 hours,and they sleep
14、less _ they grow older.A.while B.as C.when D.after 但是若强调某个动作正在进行中时，又发生但是若强调某个动作正在进行中时，又发生 了别的动作，用了别的动作，用when从句。从句。when从句必用过去从句必用过去 进行时，主句用一般过去时。进行时，主句用一般过去时。(表示在表示在when从句正从句正进行期间又发生了主句的动作进行期间又发生了主句的动作)此时此时,when=while，表时间段。，表时间段。如如:n n当学生们正在读书时，老师走进了教室。当学生们正在读书时，老师走进了教室。When/While the students were r
15、eading,the teacher came into the classroom.n n 昨晚当爸爸和妈妈正在看电视时，我到家了。昨晚当爸爸和妈妈正在看电视时，我到家了。While my parents were wacthing TV last night,I went home.若主、若主、从句两个延续动作同时进行，用从句两个延续动作同时进行，用while,则主与从句都用进行时则主与从句都用进行时,此时，此时，while译译为为“而而”“一边一边,一边一边”,如如:1.他正在读书而我正在学习。他正在读书而我正在学习。He was reading the newspaper while
16、I was studying.2.贝贝正在唱歌贝贝正在唱歌,而萍萍正在跳舞。而萍萍正在跳舞。Beibei was singing while Pingping was dancing.3.她一边听歌一边做作业。她一边听歌一边做作业。She was doing her homework while she was listening to music.4.当玻璃或砖块落下来时人们疯狂的跑了出来。当玻璃或砖块落下来时人们疯狂的跑了出来。People were running wildly while pieces of glass and bricks were falling down.5.Su
17、zy 正在堆雪人而正在堆雪人而Kitty 在她旁边站着看。在她旁边站着看。Suzy was making a snowman while Kitty was standing beside her.1.What _ your brother _(do)at 2.nine oclock last night?2.They _(listen)to music at that time.3.When I saw him,he _(search)the Internet.wasdoingwere listeningwas searchingExercise 14.They _(discuss)a pr
18、oblem in the meeting room at this time yesterday.5._ Amy _(visit)the Science Museum from 9:00 a.m.to 11:00 a.m.yesterday?were discussingWasvisiting1.My wallet dropped on the ground _ I was running.2._ I was falling asleep,there was a loud knock on the door.3._ he was reading,an earthquake started.4.
19、Were the students listening to the teacher carefully _ the teacher was giving a lesson?5._ the telephone rang,I became nervous.while When While while When Exercise 2当堂反馈当堂反馈Homework1.Make sentences with“when”,2.“while”and“as”.3.2.Finish off the exercises on pages 97,4.and 98.此此课件下件下载可自行可自行编辑修改，修改，仅供参考！供参考！感感谢您的支持，我您的支持，我们努力做得更好！努力做得更好！谢谢!