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1、2013年版英語八下Unit5 過去進行時 與when、while,（一）含義及構(gòu)成 過去進行時表示過去某一時刻或某一段時間正在進行或發(fā)生的動作，其結(jié)構(gòu)為：was / were + v. ing。 I/He/She/It was +v-ing (第一三人稱單數(shù)用was) We/You/They +v-ing,過去進行時,（1）過去進行時的否定句結(jié)構(gòu)為：was / were+ not +v. -ing ，was與not?？s寫為wasnt，were與not?？s寫為werent。 （2）過去進行時的一般疑問句結(jié)構(gòu)為：Was / Were +主語+ v. -ing+其他？ （3）過去進行時的特殊疑問句

2、結(jié)構(gòu)為：疑問詞+ was / were+主語+v. -ing+其他？,（二）用法 1. 表示過去某一時刻或某一段時間正在進行或發(fā)生的動作。與過去某一特定的時間狀語連用，常見的有：at 3 oclock yesterday afternoon, in those days, at this time yesterday等。 2. 表示過去一個動作發(fā)生時，另一個動作正在進行，持續(xù)時間長的動作用過去進行時，常用在while引導(dǎo)的時間狀語從句中。,. 用所給詞的適當形式填空 1. I _ (help) my mother with housework at ten oclock last Sunday

3、. 2. The girl _ (have) a piano lesson at this time yesterday.,過去進行時的用法,was helping,was having,3. They _ (talk) about the film when the teacher came in. 4. While he _ (wait) for the bus, he read a newspaper. 5. He said he was _ (leave) for Shanghai soon.,were talking,was waiting,leaving,. 句型轉(zhuǎn)換 1. Kat

4、e was drawing pictures when her mother came back. （改為否定句） Kate _ _ pictures when her mother came back. 2. She was babysitting her sister at this time yesterday. （改為一般疑問句） _ she _ her sister at this time yesterday?,wasnt drawing,Was babysitting,3. They were having a party when I knocked at the door.

5、（就劃線部分提問） _ _ they _ when you knocked at the door?,What were doing,. 用when或while填空 1. What were you doing _ the earthquake happened? 2. _ I was shopping in the supermarket, I met my friend Nancy.,when,While,3. I was sleeping _ my cousin came to see me. 4. My mother was doing the housework _ I was do

6、ing my homework. 5. _ the alien was in the shop, the girl called the police.,when,while,While,when and while,Both of them mean ”當?shù)臅r候”.,Are they the same? No ！,when引導(dǎo)的時間狀語從句可以表示一個時間點,也可以表示一個時間段。從句中可以用短暫性動詞,也可以用延續(xù)性動詞。從句中的動作既可與主句的動作同時發(fā)生，又可在主句的動作之前或之后發(fā)生。 It was snowing when we got to the airport. 我們到達機場

7、時, 天正下著雪。 My key dropped on the ground when I was walking in the park. 我在公園散步時, 鑰匙掉在了地上。,when,while,while引導(dǎo)的時間狀語從句常指一個時間段,從句中的動詞必須為延續(xù)性動詞。while有時還可表示主句的動作與從句的動作同時發(fā)生。 While he was reading, the phone rang. 他正在看書時, 電話鈴響了。 Some students were reading while others were writing. 一些學(xué)生在讀書, 另一些學(xué)生在寫字。,tips:,當時間

8、狀語從句中的動作與主句中的動作同時發(fā)生，且從句動作為延續(xù)性動詞時，when 與while都可以使用。 when 說明從句的動作各主句的動作可以是同時發(fā)生，也可以是先后發(fā)生，while則強調(diào)主句的動作在從句動作的發(fā)生過程中發(fā)生或者主從句動作同時發(fā)生。,tips:,通常情況下when能替代while, 但while不能替代when. 當從句和主句都用過去進行時的時候，多用while引導(dǎo)。,(2009四川瀘州) What were you doing _ Zhang Fan came in? A. when B. while C. where 【解析】三個選項分別意為“當時”、“與同時”、“哪里”，

9、結(jié)合題意“當張凡進來時，你正在做什么？”可排除B、C二項，故選A。,1. What _ (be) you _ (do) when he arrived? 2. Jim_ (sleep) when I came in. 3. They _ (watch) TV at 8:00 yesterday evening. 4. Now he _ (read) and _.,were,doing,was sleeping,were watching,is reading,writing,A. Fill in the blanks with the given words.,B. Translate the

10、se sentences into English.,1. 上課鈴響時，你在干什么？ What _ you _when the class bell rang? 2. 當我媽媽進來時我正在看書。 I _when my mother came in. 3. 昨天晚上十點鐘她正在做飯。 She _ at ten oclock _.,were,doing,was reading,was cooking,last night / yesterday evening,4. 當天開始下雨時, 孩子們正在玩游戲。 The children _ games when it _ to rain. 5. 當我進來

11、時，那只貓?zhí)优芰恕?The cat _ when I _.,were playing,began,ran away,came in,6. 飛機在倫敦著陸時, 天正下著雨。 It _ when the plane _ in London. 7. 電話鈴響的時候, 我正在吃早飯。 I _ breakfast when the telephone _. 8. 琳達睡覺時發(fā)生了什么事？ _ while Linda was sleeping?,was raining,landed,was having,rang,What happened,Do the other exercises in this part.,