when与while引导时间状语从句的区别(课堂PPT)
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It was snowing when we got to the airport. 我们到达机场时, 天正下着雪。
My key dropped on the ground when I was walking in the park. 我在公园散步时, 钥匙掉在了地上。
12
while
while引导的时间状语从句常指一个时间 段,从句中的动词必须为延续性动词。 while有时还可表示主句的动作与从句 的动作同时发生。
5
3. They w__e_r_e_t_a_lk_i_n_g_ (talk) about the film when the teacher came in.
4. While he _w_a_s_w__a_it_in__g (wait) for the bus, he read a newspaper.
9
3. I was sleeping _w_h__en__ my cousin came to see me.
4. My mother was doing the housework _w__h_il_e_ I was doing my homework.
5. _W__h_il_e_ the alien was in the shop, the girl called the police.
15
(2009四川泸州) What were you doing
_____ Zhang Fan came in?
A. when
B. while C. where
2. She was babysitting her sister at this time yesterday. （改为一般疑问句） _W__a_s__ she _b_a_b_y_s_it_ti_n_g__ her sister at this time yesterday?
7
3. They were having a party when I knocked at the door. （就划线部分提问） _W__h_a_t_ _w__er_e__ they _d_o_i_n_g_ when you knocked at the door?
3
（二）用法 1. 表示过去某一时刻或某一段时间
正在进行或发生的动作。与过去某一特 定的时间状语连用，常Leabharlann Baidu的有：at 3
o’clock yesterday afternoon, in those days, at this time yesterday等。
2. 表示过去一个动作发生时，另一 个动作正在进行，持续时间长的动作用 过去进行时，常用在while引导的时间状 语从句中。
10
when and while
Both of them mean ”当…… 的时候”.
Are they the same? No ！！！
11
when
when引导的时间状语从句可以表示一个时间 点,也可以表示一个时间段。从句中可以用
短暂性动词,也可以用延续性动词。从句中 的动作既可与主句的动作同时发生， 又可在主句的动作之前或之后发生。
8
Ⅲ. 用when或while填空 1. What were you doing _w_h_e_n__ the earthquake happened? 2. _W__h_il_e_ I was shopping in the supermarket, I met my friend Nancy.
2. when 说明从句的动作各主句的动作可 以是同时发生，也可以是先后发生， while则强调主句的动作在从句动作的发 生过程中发生或者主从句动作同时发生 。
14
tips:
1. 通常情况下when能替代while, 但 while不能替代when.
2. 当从句和主句都用过去进行时的时 候，多用while引导。
2
（1）过去进行时的否定句结构为：was / were+ not +v. -ing ，was与not常缩写为 wasn’t，were与not常缩写为weren’t。
（2）过去进行时的一般疑问句结构为： Was / Were +主语+ v. -ing+其他？
（3）过去进行时的特殊疑问句结构为： 疑问词+ was / were+主语+v. -ing+其他？
4
过去进行时的用法
Ⅰ. 用所给词的适当形式填空 1. I _w_a_s_h__el_p_i_n_g (help) my mother with housework at ten o’clock last Sunday.
2. The girl _w__a_s_h_a_v_i_n_g__ (have) a piano lesson at this time yesterday.
5. He said he was _le_a_v_i_n_g (leave) for Shanghai soon.
6
Ⅱ. 句型转换 1. Kate was drawing pictures when her mother came back. （改为否定句） Kate _w_a_s_n_’_t _d__ra_w__in__g_ pictures when her mother came back.
2013年版英语八下Unit5 过去进行时
与when、while
1
过去进行时
（一）含义及构成
过去进行时表示过去某一时刻或某一 段时间正在进行或发生的动作，其结构为： was / were + v. –ing。
I/He/She/It was +v-ing… (第一三人称单 数用was) We/You/They +v-ing…
While he was reading, the phone rang. 他正在看书时, 电话铃响了。
Some students were reading while
others were writing. 一些学生在读书, 另一些学生在写字。
13
tips:
1. 当时间状语从句中的动作与主句中的动 作同时发生，且从句动作为延续性动词 时，when 与while都可以使用。
My key dropped on the ground when I was walking in the park. 我在公园散步时, 钥匙掉在了地上。
12
while
while引导的时间状语从句常指一个时间 段,从句中的动词必须为延续性动词。 while有时还可表示主句的动作与从句 的动作同时发生。
5
3. They w__e_r_e_t_a_lk_i_n_g_ (talk) about the film when the teacher came in.
4. While he _w_a_s_w__a_it_in__g (wait) for the bus, he read a newspaper.
9
3. I was sleeping _w_h__en__ my cousin came to see me.
4. My mother was doing the housework _w__h_il_e_ I was doing my homework.
5. _W__h_il_e_ the alien was in the shop, the girl called the police.
15
(2009四川泸州) What were you doing
_____ Zhang Fan came in?
A. when
B. while C. where
2. She was babysitting her sister at this time yesterday. （改为一般疑问句） _W__a_s__ she _b_a_b_y_s_it_ti_n_g__ her sister at this time yesterday?
7
3. They were having a party when I knocked at the door. （就划线部分提问） _W__h_a_t_ _w__er_e__ they _d_o_i_n_g_ when you knocked at the door?
3
（二）用法 1. 表示过去某一时刻或某一段时间
正在进行或发生的动作。与过去某一特 定的时间状语连用，常Leabharlann Baidu的有：at 3
o’clock yesterday afternoon, in those days, at this time yesterday等。
2. 表示过去一个动作发生时，另一 个动作正在进行，持续时间长的动作用 过去进行时，常用在while引导的时间状 语从句中。
10
when and while
Both of them mean ”当…… 的时候”.
Are they the same? No ！！！
11
when
when引导的时间状语从句可以表示一个时间 点,也可以表示一个时间段。从句中可以用
短暂性动词,也可以用延续性动词。从句中 的动作既可与主句的动作同时发生， 又可在主句的动作之前或之后发生。
8
Ⅲ. 用when或while填空 1. What were you doing _w_h_e_n__ the earthquake happened? 2. _W__h_il_e_ I was shopping in the supermarket, I met my friend Nancy.
2. when 说明从句的动作各主句的动作可 以是同时发生，也可以是先后发生， while则强调主句的动作在从句动作的发 生过程中发生或者主从句动作同时发生 。
14
tips:
1. 通常情况下when能替代while, 但 while不能替代when.
2. 当从句和主句都用过去进行时的时 候，多用while引导。
2
（1）过去进行时的否定句结构为：was / were+ not +v. -ing ，was与not常缩写为 wasn’t，were与not常缩写为weren’t。
（2）过去进行时的一般疑问句结构为： Was / Were +主语+ v. -ing+其他？
（3）过去进行时的特殊疑问句结构为： 疑问词+ was / were+主语+v. -ing+其他？
4
过去进行时的用法
Ⅰ. 用所给词的适当形式填空 1. I _w_a_s_h__el_p_i_n_g (help) my mother with housework at ten o’clock last Sunday.
2. The girl _w__a_s_h_a_v_i_n_g__ (have) a piano lesson at this time yesterday.
5. He said he was _le_a_v_i_n_g (leave) for Shanghai soon.
6
Ⅱ. 句型转换 1. Kate was drawing pictures when her mother came back. （改为否定句） Kate _w_a_s_n_’_t _d__ra_w__in__g_ pictures when her mother came back.
2013年版英语八下Unit5 过去进行时
与when、while
1
过去进行时
（一）含义及构成
过去进行时表示过去某一时刻或某一 段时间正在进行或发生的动作，其结构为： was / were + v. –ing。
I/He/She/It was +v-ing… (第一三人称单 数用was) We/You/They +v-ing…
While he was reading, the phone rang. 他正在看书时, 电话铃响了。
Some students were reading while
others were writing. 一些学生在读书, 另一些学生在写字。
13
tips:
1. 当时间状语从句中的动作与主句中的动 作同时发生，且从句动作为延续性动词 时，when 与while都可以使用。