Unit 8 Natural disasters Grammar2 教案
学习目标
能够了解并掌握用when,while和as引导的时间状语从句与过去进行时连用的几种情况。 学习重点学习用when和while引导的时间状语从句与过去进行时连用的几种情况。 学习难点在过去进行时中正确使用when, while 和 as.
课 前 自 学
找出用when / while/ as引导的时间状语从句与过去进行时连用的情况.查资料搞清楚它的用法.
二.有时为了句子表达的需要,我们可以用复合句来表达过去进行时. 在过去进行时中when,while和as用法及其区别。昨晚当我到家的时候, 妈妈和爸爸正在看电视
My parents_________(watch) TV when I arrived home last night.
刚才当老师走进教室的时候,学生们正在读书.
Students ____________(read)when the teacher came in just now.
在这些句子中,when引导的句子表过去的某一个具体的时间,when从句用一般过去时,而它的主句用过去进行时.
但是若强调某个动作正在进行中时,又发生了别的动作,用while/as从句. 如 _________ we were having supper, the light went out._________ he was riding a bike, he fell off and hurt his leg. 若主,从句两个延续动作同时进行,用while,则主句与从句都用进行时,
此时,while译为“而” “一边,一边”,如:
He was reading the newspaper __________ I was studying.
三．（热身一下吧）用 when ,while或as填空。1. My mum was sleeping ______ my aunt came to visit her.2. My father was working in the garden _______ I was sitting in the sun.
3. ________ he came yesterday, we were playing basketball. 4. _______ we were laughing , the teacher came in5. _______ the Whites were having supper, I knocked at the door.
1.当到Simon的时候, Amy正在从地上取雪. ________ Simon ________ , Amy _______ ________ some snow from the ground.
3.Suzy在堆雪人的而Kitty就站在她的旁边. Suzy _______ ___________ a snowman ________ Kitty _______ ________ beside her.
4.正当Mary在拍照的时候,Andy朝她跑了过来.
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