八年级上英语unit8 grammar

课件22张PPT。Past continuous tense过去进行时过去进行时主要表示：
? 在过去某一时刻正在进行的动作
They were eating breakfast at 7:00 am
yesterday.
(b) I was writing a letter at this time
yesterday.
(c) Five minutes ago, Danny was looking
out of the window and Suzy was
reading a book.Past continuous tense? 在过去某段时间一直在进行的动作
(a) From 1983 to 1998, he was teaching
at Yale.
(b) They were building a dam last
winter.Past continuous tense 2. 过去进行时的句式
(1) 基本结构：was / were + verb-ing
(2) 否定式：was / were not + verb-ing
was not = wasn’t were not = weren’tI was doing some shopping.
People were running wildly.I was not reading.
People were not running wildly. (3) 疑问句：将 was / were 调到主语前
结构为:Was/Were+主语+verb-ing?
回答：Yes, 主语+was/were.
No, 主语+ was not/wasn’t.
were not/weren’t.Was he running?
Yes, he was. / No, he wasn’t.Were they running?
Yes, they were. / No, they weren’t.Past continuous tense
with ‘while’ , ‘when’ and ‘as’ when, while 和 as 这三个词都有
“当……时候”的意思。
There were fewer sandstorms when my grandparents were young.
我祖父母年轻时沙尘暴要少些。Past continuous tense with
‘while’ , ‘when’ and ‘as’While Mille was watching TV, her mum was sleeping.
米莉在看电视时，妈妈在睡觉。
I saw a traffic accident as I was riding to school this morning.
今天早晨我骑自行车时看到一起交通事故。2.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，从句中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
o’clock.
2. While he woke up, it was eight
o’clock.
3. When/While/As I was waiting for a
bus, I met her. ×√√3. When引导的从句的谓语动作可以在主句的
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 while.(finished 先发生)
When I got to the museum, the door was closed.
（got to后发生)
While/As I was sleeping, the telephone rang.
(was sleeping和 rang同时发生)4.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.当我们正在看书的时候，一个陌生人走了进来。(read 为延续性动词 )5.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。
They were rowing boats while we were climbing
the hill.当我们在爬山时，他们在划船。６．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。It began to rain heavily while we were having dinner. 我们在吃晚饭时，开始下起大雨。7．强调某个动作正在进行的时候，另一个动作突然发生，常用“过去进行时／when／一般过去时”结构。I was walking in the street when he called me.
我正在街上走时，他突然喊我。8.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 sang as they played.
小姑娘们一边玩，一边唱。过去进行时之常见短暂性动词和延续性动词汇总:
一、短暂性动词：短暂性动词表示动作（事情）较短时间结束的动词，这种动词是指它们动作的开始也就意味着动作的结束。不能和进行时态连用。常见的短暂性动词主要有：
arrive in(at)get toreach到达；come backreturn 归来、回来；land 着陆；leave 离开；go 去；come来；see 看见；hear 听到；borrow 借入；lend借出；close 关闭；open打开； beginstart开始； finish 结束、完成；become (get)变成、成为；lose 丢失；find 找到、发现；fall跌倒、降落；join 参加、加入；die 去世、死亡；get up起床；go to bed 去睡觉；wake up 苏醒、醒来；buy买；sell卖；turn on打开（电源）；turn off关闭（电源）… 例如：
1）这辆自行车我已经买了五年了。
I?have?bought?this?bike?for?five?years.
（此句突出“买”的动作。言下之意，到现
在还没有买到。）
?2)这位老人已经去世五年了。 The?old?man?has?died?for?five?years.(
此句突出“死”的动作，给人的感觉是“这位
老人五年期间一直在死亡线上挣扎”。)? 二、延续性动词：表示动作（事情）延续一段时间完成的动词，可以和进行时态连用。常见的延续性动词主要有：
do做、干； walk 步行；look at 看；look for 寻找；watch观看； listen to 听；wait for 等候；wear 穿（戴）着；talk交谈； play 玩耍；study 学习；work 工作；read 阅读；write 书写；eat 吃饭；sleep 睡觉；keep 保存；clean打扫； cook 做饭；have 有……
三、when“当……的时候”后面的动词一般采用短暂性动词的一般时态；while“当……的时候”后面的动词一般采用延续性动词的进行时态。1、Just now _______ I _______ (come) in, he ___________ (read) a book.
刚才当我进来的时候，他正在看一本书.
2、The boy___________ (walk) on the street ____ UFO________ (land) yesterday evening.
昨晚那个男孩正在街上行走，当飞碟着陆的时候.
3、_______ we ________(swim) in the river, we __ (see) a fish jump out of the water this morning.
当我们正在河里游泳的时候，我们看见一条鱼跳出了水面. camewas readingwas walkingwhen/aslandedWhen/as/whilewere swimmingsawWhen/as4、______he__________ (read) , I ______ (write) at this time of yesterday.
昨天这个时候当他看书时，我在写字.
5、Yesterday afternoon_____ I______ (get) home, my wife___________ (cook) dinner.
6、An hour ago______ you _______ (leave) the bedroom, they __________(argue) with Mr Luo.
7、_____ I________ (watch) the basketball game, suddenly the ball ________(fly) over and _____ (hit) me.
8、Yesterday evening ______ my parents _____ (wash) clothes, my sister and I ________(clean)
the room.
Whilewas readingwas writingWhen/asgotWas cookingwhenleftboughtwas watchingwhilefliedhit whilewere washingwas cleaning9、What _____ your mother ______(do)____ the telephone_______ (ring)? My Mother ________ (sleep) , so she didn’t hear.
四、1、What____ you_____ (do) at 9:00 last night? I________ (watch) TV.
2、Look! They___________ (play) computers again, an hour ago they_________ (play) computers 3、While Jenny ____________ (listen) to music, the telephone _______ (ring).
4、When we _____ (get) home, it_________ (rain) yesterday morning. weredoingwhenrangwas sleepingwere doingwas watchingare playingWere playingWas listeningranggotwas raining5、We_________ (buy) a basketball last week, but it is lost, so we__________ (buy) another one tomorrow.
6、They ___________ (do) their homework at 7:00P.M. last night.
7、We _________ (play) computers last night.
8、They were watching TV when I came in.
(变成否定句)

9、The police were looking for that thief.
(一般疑问句)
boughtWill buy Were doingplayedThey were not watching...Were the police looking for that thief.