過去進行時中連詞when和while的區(qū)別課件

1、Unit5 What were you doing when the rainstorm came？過去進行時中連詞when和while的區(qū)別I was doing my homework while Lucy was watching TV.過去進行時的結(jié)構(gòu)：was/were+doing .when和while都可以表示“當.的時候”，引導時間狀語從句。那when和while兩者用法有什么區(qū)別呢？過去進行時中when和while的用法PART 02 1 .(1).when意為“在時刻或時期”，它可兼指“時間點”與“時間段”，所引導的從句的動詞既可以是短暫性動詞，也可是延續(xù)性動詞。When t

2、he teacher came in, they were drawing a tiger. 短暫性的動作延續(xù)性的動作(2).while只指時間段，不指時間點，從句的動詞只限于持續(xù)性動詞。如My mother was watching TV last night, while my father was playing games. 延續(xù)性的動作延續(xù)性的動作2.(1)When 說明從句的動作和主句的動作可以是同時的，也可以是先后發(fā)生。(2)While則強調(diào)主句的動作和在從句動作發(fā)生的過程中或主從句兩個動作同時發(fā)生。The boy fell asleep when/ while I was re

3、ading.3.(1)由when引導的時間狀語從句，主句用過去進行時，從句應用一般過去時。(2)如果從句和主句的動作同時發(fā)生，兩句都用過 去進行時的時候，多用while引導。When the teacher came in ,we were talking .當老師進來的時候，我們正在談論。They were singing while we were dancing.我們正在跳舞的時候，他們正在唱歌。主句：過去進行時從句：過去進行時從句：一般過去時主句：過去進行時3.(1)由when引導的時間狀語從句，主句用過去進行時，從句應用一般過去時。(2)如果從句和主句的動作同時發(fā)生，兩句都用過 去進

4、行時的時候，多用while引導。主句從句When當?shù)臅r候過去進行時（was/were+v-ing)一般過去時（v-ed)While當?shù)臅r候一般過去時（v-ed)過去進行時（was/were+v-ing)While同時過去進行時（was/were+v-ing)過去進行時（was/were+v-ing)4.When和while還可以作并列連詞，when表示在那時，while表示“而，卻”，表示對照關系。 如The children were running to move the bag of rice when they heard the sound of a motor bike.He is strong while his brother is weak.練一練PART 031.We were talking_ the teacher came into theclassroom.2.I was singing _ he was dancing.3._ I was cut