资源简介

(共28张PPT)
Unit 8
Safe and sound
Grammar
能够掌握过去进行时的用法和结构。
01
学习目标
能够掌握when, while以及as引导的时间状语从句的用法。
02
What is Tom doing
What is Lucy doing
现在进行时：am/is/are + doing
Tom/He is playing football.
Lucy/She is reading a book.
Lead in
What was Tom doing at that moment
What was Lucy doing at 2:30 p.m. yesterday
过去进行时:was/were + doing
Tom/He football.
Lucy/She a book.
was reading
was playing
was playing
was reading
Why don’t we use “is doing”
Because we talk about things that happen in the past (在过去) not now.
Work out
the rule!
We use the past continuous tense to talk about things that were happening at a particular time in the past. We form the past continuous tense like this:___________ + v-ing.
was/were
Read the conversation below and pay attention to the use of the past continuous tense.
Suzy: There was an accident near our school at 4:10 yesterday
afternoon. It happened as we were going home from school.
Amy: I know. I saw it while I was riding my bike home. It was raining
when the police arrived.
Suzy: I didn’t see it. I hope no one was badly hurt.
新课讲授
Read and summarise
过去进行时
e.g. Tom was playing football at that time.
He was visiting Beijing that week.
用法：过去进行时表示在过去某一时刻正在进行的动作或过去某一阶段一直在进行的动作。
构成：过去进行时句子中的谓语部分由“was/were+ 现在分词” 构成，与现在进行时结构相似，只是把现在进行时中的am/is/are 变成了was/were。
Summary
She was playing computer games at this time last night.
They were playing basketball when I walked past the playground.
He was reading newspaper from 8 to 9 yesterday morning.
Were they learning English at 7 this morning
No, they were not learning English.
Was she talking at that time
No, she was not talking at that time.
Read and summarise
过去进行时的句式结构
肯定句 主语+was/were+ 现在分词（+ 其他）. e.g. I was doing my homework at eight last night.
昨晚八点我在做我的作业。
否定句 主语+was/were+not/wasn’t/weren’t + 现在分词（+ 其他）. e.g. I wasn’t helping my father in the garden at this time yesterday. 昨天这个时间,我没有在花园里帮爸爸干活。
Summary
一般 疑问句 —Was/Were+ 主语+ 现在分词（+ 其他）？ —Yes, 主格代词+was/ were./ No, 主格代词+wasn’t/weren’t. e.g.—Were you doing housework at that time 那时你在做家务吗？
—Yes, I was./No, I wasn’t. 是的，我在做。/ 不，我没在做。
特殊 疑问句 特殊疑问词(不作主语)+ was/were + 主语+ 现在分词(+ 其他) / 特殊疑问词(作主语)+was/ were+ 现在分词(+其他)？ e.g. What were you reading this morning 今天上午你在读什么？
Who was playing basketball here last night 昨天晚上谁在这里打篮球？
时间状语：
过去进行时表示过去某一时刻正在进行的动作以及过去某一阶段
一直在进行的动作,常与表示过去的具体时间等连用如:this morning,
the whole morning, all day, from nine to ten, last evening, at that time,
at this time yesterday, at 9 last night, at that moment。或者在when,
while, as引导的时间状语从句中使用。
过去进行时和一般过去时的区别:
1.过去进行时:强调过去某一时刻或时间段内正在进行或持续的动作。
e.g. He was playing basketball at three yesterday afternoon.
昨天下午三点他正在打篮球。
2.一般过去时:表示动作发生在过去，且往往已经完成。
e.g. He played basketball yesterday afternoon.
昨天下午他打篮球了。
My brother ____________(make) a model plane at nine last night.
2. Lucy and Lily __________ (lie) on the playground at that time.
3. _____ you _________ (plan) a trip to Australia at this time yesterday.
4. I _______________ (not visit) the museum from 9a.m. to 11a.m. yesterday.
was making
were lying
Were planning
wasn’t visiting
根据句意及提示完成下列句子。
Practice
5. — ______ your daughter ______ (do) homework at home the whole morning
— No , she ______. She was watching TV.
6. Look! The girls _____________ (count) birds. I remember they ____________ (count) birds this time last week, too.
7. – Jim, I called you yesterday afternoon but nobody answered.
— Oh, I ____________(shop) at a market.
Was doing
wasn’t
are counting
were counting
was shopping
When, while and as can be used as conjunctions of time. They all mean “during the time that...”.
I was working when the earthquake started.
People were running in all directions while pieces of glass and bricks were raining down.
As I was trying to find my way out, I suddenly heard some noise above me.
When a shorter action happened at the same time as a longer action, we use the past continuous tense for the longer action and the simple past tense for the shorter action. When there are two long actions, we often use while.
We were watching in fear while the firemen were putting out the fire.
Presentation
If the shorter action is in the main clause, we can use when, while or as to join the clauses.
When/While/As Millie was watching TV, the lightning hit her building.
If the longer action is in the main clause, we often use when to join the clauses.
Millie was watching TV when the lightning hit a nearby building.
While, when, as 的用法
when, while和as 用作从属连词,都有“当……的时候”之意,引导时间状语从句,它们的用法和区别如下：
1)when, while和as这三个词均有“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。
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。
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. ( √)
While he woke up, it was eight o'clock. ( × )
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.
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.(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主句动作为瞬间动作,从句动作为延续性动词时, when、while和as都可使用。
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)
5)强调过去的两个动作同时进行(主句与从句均为延续性动词),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/ when/as+过去进行时”结构。
It began to rain heavily while/when /as 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。
I was walking in the street when he called me.我正在街上走时，他突然喊我。
8）在将来时从句中，常用when，且从句须用一般时代替将来时。
When the manager comes here for a visit next week, I’ll talk with him about this．下周经理来这参观时,我会和他谈谈此事。
用when、while或as填空。
My wallet dropped on the ground ____________ I was running.
2. _______________ he was reading, an earthquake started.
3. Were the students listening to the teacher carefully _______ the teacher was giving a lesson
4. _______ the telephone rang, I was listening to music.
when/while/as
while
When
When/While/As
Practice
While I ___________(sleep), I_________(smell)the nice egg.
I__________(do) homework when you__________(come) here.
While I ___________(watch) TV, you___________(cook) the dinner.
She _________(wave) to the visitors while she__________(dance) to the music.
5. _____ you ______(talk) when the teacher came in Yes, we were.
6. While Mom __________(cook) dinner yesterday, I __________(enjoy) some music.
was sleeping
smelt
was doing
came
was watching
were cooking
waved
was dancing
Were talking
was cooking
was enjoying
根据句意及提示完成下列句子。
Another snowstorm hit Harbin. Simon is asking his grandpa about plete their conversation with the correct forms of the verbs in brackets.
Simon: Hello, Grandpa. How was your day
Grandpa: Not bad. Thank you, Simon. We just had the third snowstorm of this winter. It (1) ____________ (get) stronger while I (2) _____________ (read) the
newspaper at about 7 this morning. What about you, Simon
Simon: We’re all very well, Grandpa. It (3) ______________ (snow) here in Beijing
when we went to the Palace Museum during the day. Lots of people (4)
________________ (enjoy) the beauty of the Palace Museum in the snow.
Grandpa: Sounds nice. Maybe I (5) _______________ (watch)
the wonderful view on TV while you
(6) _____________ (visit) there.
Simon: Yeah, it was really e and take a look
by yourself next time.
was getting
was reading
was snowing
were enjoying
was watching
were visiting
Simon’s cousin Vicky is writing about the plete her article with the correct forms of the verbs in brackets.
Joy after the snowstorm
Harbin woke up to a winter wonderland last week. There was a big snowstorm.
When I got up on Saturday morning, it (1) ___________(snow) heavily. The wind (2) ____________(blow) hard all morning, but that just meant more time for fun inside with my family.
It stopped snowing in the afternoon. Guess what I did I built a snowman! I (3) ________ (draw) a big smile on his face, put my hat on his head and took a photo. When it was almost time for dinner, I went home. Some people in the neighbourhood (4) ___________ (clear) the snow from the streets.
When I got home, my parents (5) ___________(get) dinner ready. While we (6) ____________(enjoy) our meal, it began to snow again. It was so nice to have hot jiaozi on a cold day!
was snowing
was blowing
drew
were clearing
were getting
were enjoying
Write about an emergency or a natural disaster that happened in your hometown, or one you heard about, using the past continuous tense.
1. I _________ my homework when Mike _____ last night.
昨天晚上迈克来的时候我正在写作业。
2. While Ann ____________TV, her father _____ home.
安正在看电视时，她父亲回来了。
3. What were you doing when I ________ at the door
我敲门的时候你在干什么？
4. She ______________the room when I ____ to see her.
我去看她的时候她不是在打扫房间。
5. I _____________my vocation in England at this time last summer.
去年夏天的这个时候我正在英国度假。
was doing
came
was watching
got
knocked
wasn’t cleaning
went
was spending
翻译下列句子
当堂检测
6. Mary __________ while Peter __________ the piano.
Mary在跳舞，而Peter在弹钢琴。
7. They ____________ the newspaper when I ________ the room.
我走进屋子时他们正在看报纸。
8. What ____ you _____ at five yesterday afternoon
昨天下午5点你在做什么？
9. The students ______________ for their lessons when Mr Black ______ the classroom.
Black先生走进教室的时候学生们正在准备功课。
10.The teacher __________ to some parents when I ____ her.
我见到老师的时候她正在和家长谈话。
was dancing
was playing
were reading
went into
were
doing
were preparing
was talking
entered
saw
11. 昨天这时，我们正在通过电视看篮球赛。
At this time yesterday, we _______________________________ on TV.
12. 那时，我站在树后，而汤姆在堆雪人。
I _____________ behind the tree while Tom ______________________ at that time.
13. 当玻璃和砖块掉下来时，人们在疯狂地逃跑。
People ________________ wildly while pieces of glass and bricks _____________________.
14. 当你在观鸟时， 你的同学们在做什么？
What _________________________ while you __________________
15. 昨天下午3：00点，他们不在写关于地震的故事。
They __________________ about the earthquake at 3:00 yesterday afternoon.
were watching a basketball match
was standing
was making a snowman
were running
were falling down
were your classmates doing
were watching birds
weren’t writing a story

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