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外研版 (新标准)八年级上册Module 8 AccidentsUnit 3 Language in use .教学演示ppt课件
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这是一份外研版 (新标准)八年级上册Module 8 AccidentsUnit 3 Language in use .教学演示ppt课件，共12页。PPT课件主要包含了完成下列句子，when，saw，while，WhenWhile，按要求改写下列句子等内容，欢迎下载使用。
While the lights were changing t red, a car suddenly appeared rund the crner.When Henry was trying t find the snake, his hand began t hurt badly.I was trying t pick it up when it bit me again.
过去进行时是指在过去的某一时间进行或发生的动作或事情，可以和at…yesterday mrning；at that time；frm nine t ten last night等时间状语连用。
We were watching TV frm six t nine last night.What was he researching all day last Sunday?It was raining at 6 'clck this mrning.
过去进行时还可以和when, while, as引导的过去时间状语从句连用，形成复合句。
When he was lying there in great pain, Henry suddenly remembered the pht.While the snake was lying n the table, Henry quickly picked up his mbile phne and tk a pht with it.As the dctrs were checking him, the pain gt wrse.
1. when可以和延续性动词连用，也可以和短暂性动词连用；而while只能和延续性动词连用。
They arrived while we were having dinner. While Jim was mending his bike, Lin Ta came t see him. Yu can’t d yur hmewrk while yu’re watching TV.
My pen drpped n the grund when I was walking in the park.When I saw him, he was cleaning his rm.
1. What bk ______ yu ______ (read) when I ______(see) yu at fur yesterday afternn? 2. Mrs. White (ck) dinner when her sn came hme.3. Mrs. White saw a snake while her sn (play) chess.4. They were laughing ______ the teacher appeared in frnt f them.
were reading
was playing
2. 由when引导的时间状语从句，如果主句是过去进行时，从句是一般过去时，表示一个动作正在进行的时候另一个动作突然发生了，强调后一动作发生的突然性。
We were talking when the teacher came in.We were having a picnic in the park when it began t rain.I was walking alng the street when Jhn shuted t me.
when/while引导时间状语从句区别
3. 当主句和从句的动作都是延续的或同时发生的，两句都用过去进行时的时候，多用while引导。
They were singing while we were dancing. Yesterday while Tny was having lunch with his friends, I was listening t music.Alice was reading a bk while her mther was cleaning the windws.
1. —Did yu see Mr. Black just nw? —Yes. He was repairing his car I met him.2. He was listening t music he was riding his bike.3. I was waiting at the lights I saw the by fall ff his bike.4. ___________ I was ding my hmewrk, my sister came in.
用while或when完成下列句子
1. I was ding my hmewrk. My parents were reading bks.(合并为一句)I was ding my hmewrk __________ my parents were reading bks.2. The bys were playing ftball. It began t rain.(合并为一句)The bys were playing ftball ____________ it began t rain.3. He reads the newspaper every mrning.(用时间状语at 7:00 am yesterday改写句子)He ________ __________ the newspaper at 7:00 am yesterday.
was reading
While the lights were changing t red, a car suddenly appeared rund the crner.When Henry was trying t find the snake, his hand began t hurt badly.I was trying t pick it up when it bit me again.
过去进行时是指在过去的某一时间进行或发生的动作或事情，可以和at…yesterday mrning；at that time；frm nine t ten last night等时间状语连用。
We were watching TV frm six t nine last night.What was he researching all day last Sunday?It was raining at 6 'clck this mrning.
过去进行时还可以和when, while, as引导的过去时间状语从句连用，形成复合句。
When he was lying there in great pain, Henry suddenly remembered the pht.While the snake was lying n the table, Henry quickly picked up his mbile phne and tk a pht with it.As the dctrs were checking him, the pain gt wrse.
1. when可以和延续性动词连用，也可以和短暂性动词连用；而while只能和延续性动词连用。
They arrived while we were having dinner. While Jim was mending his bike, Lin Ta came t see him. Yu can’t d yur hmewrk while yu’re watching TV.
My pen drpped n the grund when I was walking in the park.When I saw him, he was cleaning his rm.
1. What bk ______ yu ______ (read) when I ______(see) yu at fur yesterday afternn? 2. Mrs. White (ck) dinner when her sn came hme.3. Mrs. White saw a snake while her sn (play) chess.4. They were laughing ______ the teacher appeared in frnt f them.
were reading
was playing
2. 由when引导的时间状语从句，如果主句是过去进行时，从句是一般过去时，表示一个动作正在进行的时候另一个动作突然发生了，强调后一动作发生的突然性。
We were talking when the teacher came in.We were having a picnic in the park when it began t rain.I was walking alng the street when Jhn shuted t me.
when/while引导时间状语从句区别
3. 当主句和从句的动作都是延续的或同时发生的，两句都用过去进行时的时候，多用while引导。
They were singing while we were dancing. Yesterday while Tny was having lunch with his friends, I was listening t music.Alice was reading a bk while her mther was cleaning the windws.
1. —Did yu see Mr. Black just nw? —Yes. He was repairing his car I met him.2. He was listening t music he was riding his bike.3. I was waiting at the lights I saw the by fall ff his bike.4. ___________ I was ding my hmewrk, my sister came in.
用while或when完成下列句子
1. I was ding my hmewrk. My parents were reading bks.(合并为一句)I was ding my hmewrk __________ my parents were reading bks.2. The bys were playing ftball. It began t rain.(合并为一句)The bys were playing ftball ____________ it began t rain.3. He reads the newspaper every mrning.(用时间状语at 7:00 am yesterday改写句子)He ________ __________ the newspaper at 7:00 am yesterday.
was reading
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