牛津译林版英语8A Unit8 Natural disasters导学案
【质疑拓展】
1. 过去进行时的用法:
① 过去某个时间正在发生的动作。
e.g. He was cooking at six last night. 昨天晚上六点,他正在做饭。
② 过去某段时间正在发生的动作。
e.g. I was staying here from March to May last year. 去年从三月到五月,我一直呆在这里。
2. 常与过去进行时连用的时间状语,有:at nine last night, at that time =then/at this time yesterday, when the teacher came in, while he was reading等。
3. 过去进行时的构成:was/were + v-ing
4. 过去进行时的四个基本句型。
① 肯定句: He was cooking at six last night.
② 否定句: He was not cooki ng at six last night.
③ 一般疑问句: Was he cooking a t six last night?
回答: Yes, he was. No, he wasn’t.
④ 特殊疑问句: What was he doing at six last night?
5. 过去进行时的固定句型。
1) 根据汉语意思翻译下列句子。
① 当发生地震时,我正在购物。
I ____ __ ____ ___ some shopping when it __________.
② 当玻璃、瓦片往下掉的时候,人们正慌乱地跑着。
People ____ _ __ _________ wildly while pieces of glass and bricks ________ ________ down.
③ 我正在寻找出路时,突然我听到头顶上有声音。
I ________ ________ to find my way out when I suddenly ______ __Some noise above me.
2) 讨论: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,如以上3句。
3) 在过去进行时中when 和while用法及其区别。
① 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.
② 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.
总结:1. 在这些句子中,when引导的句子表示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。
2. 但是若强调某个动作正在进行中时,又发生了别的动作,用when从句。when从句必用过去进行时,主句用一般过去时。若表示在when从句正进行期间又发生了主句的动作,此时,when=while,表时间段。
e.g. _______ ___we were having supper, the light went out.
____________he was riding a bike, he fell off and hurt his leg.
3. 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”。
e.g. He was reading the newspaper ____ ______ I was studying.