外研版八年级上册Module 8 Unit3 过去进行时课件
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本课我们主要来分析when和while从句与过去进行时连用的几种情况。
when和while引导的时间状语从句区别1：
when引导的 时间状语从句
while引导的 时间状语从句
时间状语 指时间点或时间段
时间段
动词 终止性动词或延续性动词
延续性动词
They arrived while we were having dinner. 我们吃饭的时候他们到了。 这句话还可以写成： They arrived when we were having dinner.
when和while引导的时间状语从句区别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. 他们在唱歌，我们在跳舞。
as引导的时间状语从句
As的意思是“正当…时候”“随着…”它既可表示一个具体的 时间点，也可以表示一段时间。as可表示主句和从句的动作同 时发生或同时持续，又可表示一个动作发生在另个动作的持续 过程中。
As I got on the bus. he got off. 我上车，他下车。 As the doctors were checking him, the pain got worse. 医生给他做检查时，疼痛加剧了
注意:如主句谓语动词表示的是短暂动作，从句时间状语指一段时间，when， while，as三者可通用。 Peter came in while /as I was watching TV. 当 Peter进来的时候我正在看电视。 I was watching TV when Peter came in. 当 Peter进来时我正在看电视。 He entered the room when/as/while the meeting was going on. 正当开会的时候他走进了房间。
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和while的区别：
Module 8
Accidents
Language in use
1. While the lights were changing to red, a cຫໍສະໝຸດ Baidur suddenly appeared round the corner. 2. When Henry was trying to find the snake, his hand began to hurt badly. 3. I was trying to pick it up when it bit me again. 4. One day, when Henry was working in a restaurant, a snake suddenly appeared and bit his hand. 5. While the snake was lying on the table, Henry quickly picked up his mobile phone and took a photo with it. 6. As the doctors were checking him, the pain got worse. 7. As he was lying there in great pain, Henry suddenly remembered the photo.
1. 定义&构成:
表示过去某一时刻或一段时间内正在进行的动作。 常和表示过去时间的词组at … yesterday morning, at that time或从句连用。 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。
When I met him, he was playing with his son. 我遇见他时，他正在和他儿子玩。 While I was doing my homework, my sister was listening to music. 当我在做作业时，我妹妹在听音乐。 As he was lying in bed, the telephone rang. 他躺在床上时，电话铃响了。
• 动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词 和终止性动词。延续性动词表示能够延续的动作，这种动作可以延续 下去或产生持久影响。如：
learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等。
由when引导的时间状语从句，若主句用过去进行时、从句用一 般过去时，则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，但while在这种用法中并不 强调突然性。
注意观察下面的句子：
We were talking when the teacher came in. 我们正在讲话，老师(突然)进来了。 While we were talking, the teacher came in. 我们正在讲话的时候，老师进来了。 (只表明老师进来的事实，不强调突然性)
• 终止性动词也称非延续性动词、瞬间动词或短暂性动词，表示不能 延续的动作，这种动作发生后立即结束。如
open, close, finish, begin, come, go, arrive, reach, get to, leave, move, borrow ,buy等
when和while引导的时间状语从句区别2：
when和while引导的时间状语从句区别1：
when引导的 时间状语从句
while引导的 时间状语从句
时间状语 指时间点或时间段
时间段
动词 终止性动词或延续性动词
延续性动词
They arrived while we were having dinner. 我们吃饭的时候他们到了。 这句话还可以写成： They arrived when we were having dinner.
when和while引导的时间状语从句区别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. 他们在唱歌，我们在跳舞。
as引导的时间状语从句
As的意思是“正当…时候”“随着…”它既可表示一个具体的 时间点，也可以表示一段时间。as可表示主句和从句的动作同 时发生或同时持续，又可表示一个动作发生在另个动作的持续 过程中。
As I got on the bus. he got off. 我上车，他下车。 As the doctors were checking him, the pain got worse. 医生给他做检查时，疼痛加剧了
注意:如主句谓语动词表示的是短暂动作，从句时间状语指一段时间，when， while，as三者可通用。 Peter came in while /as I was watching TV. 当 Peter进来的时候我正在看电视。 I was watching TV when Peter came in. 当 Peter进来时我正在看电视。 He entered the room when/as/while the meeting was going on. 正当开会的时候他走进了房间。
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和while的区别：
Module 8
Accidents
Language in use
1. While the lights were changing to red, a cຫໍສະໝຸດ Baidur suddenly appeared round the corner. 2. When Henry was trying to find the snake, his hand began to hurt badly. 3. I was trying to pick it up when it bit me again. 4. One day, when Henry was working in a restaurant, a snake suddenly appeared and bit his hand. 5. While the snake was lying on the table, Henry quickly picked up his mobile phone and took a photo with it. 6. As the doctors were checking him, the pain got worse. 7. As he was lying there in great pain, Henry suddenly remembered the photo.
1. 定义&构成:
表示过去某一时刻或一段时间内正在进行的动作。 常和表示过去时间的词组at … yesterday morning, at that time或从句连用。 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。
When I met him, he was playing with his son. 我遇见他时，他正在和他儿子玩。 While I was doing my homework, my sister was listening to music. 当我在做作业时，我妹妹在听音乐。 As he was lying in bed, the telephone rang. 他躺在床上时，电话铃响了。
• 动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词 和终止性动词。延续性动词表示能够延续的动作，这种动作可以延续 下去或产生持久影响。如：
learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等。
由when引导的时间状语从句，若主句用过去进行时、从句用一 般过去时，则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，但while在这种用法中并不 强调突然性。
注意观察下面的句子：
We were talking when the teacher came in. 我们正在讲话，老师(突然)进来了。 While we were talking, the teacher came in. 我们正在讲话的时候，老师进来了。 (只表明老师进来的事实，不强调突然性)
• 终止性动词也称非延续性动词、瞬间动词或短暂性动词，表示不能 延续的动作，这种动作发生后立即结束。如
open, close, finish, begin, come, go, arrive, reach, get to, leave, move, borrow ,buy等
when和while引导的时间状语从句区别2：