课件21张PPT。外研版
高一年级 (必修2)
Module 3Grammar时间状语从句when, while, as, before, after, until/till, since, ever since(自..以来), whenever, as soon as(一..就..), no sooner… than(一..就..), hardly / scarcely… when(刚…就…)等1). 常见的连接时间状语从句的连接词有:When 还有意义为‘这时’,(at this time)‘那时’(at that time) 常用于下列句型:
Somebody was doing something when……
某人正在做 ……突然 ……WhenEg. I was reading English when my teacher came in.
He (watch ) TV when the telephone ran. was watching分析:while引导的从句表示“在……过程中”,强调某一段时间内主句和从句的动作在同一时期发生。从句的动作表示较长时间,因此常用延续性动词。While观察:
While they were doing homework, someone broke into the house.
While he was still a teenager, he was a big star.She is tall while I am short. While 表示强烈的对比关系,可译成“然而”While I was studying English, he was playing football.强调两个动作同时进行两种情况一起发展变化as试观察:
1) As they were picking tea(采茶), the girls were singing happily.2) As he grew older, he found it difficult to compose good music.分析:as引导的从句表示“当……时;一边……一边……”,主句和从句的动作同时发生,强调伴随。有时可译为“随着”。2). 时间状语从句可以转换成分词短语。如:
* Boys need to develop their bodies fully before they attempt such difficult exercise.
Boys need to develop their bodies fully before attempting such
difficult exercise.*After he worked there for 30
years, Haydn moved to London.
Note:
时间状语从句转换成分词短语时, 时
间状语从句的主语和主句主语必须
一致才可以。 Having worked there for 30 years,
Haydn moved to London. nowpastfuture过去完成现在完成过去完成式表示在过去某个时刻之前已经完成的动作。过去完成时过去完成时的构成:
“助动词had+过去分词”
The public wondered why the president hadn’t attended the top conference.
2. 过去完成时的用法:
1). 过去完成时主要用来表明在某个时间或动作之前已经发生的动作, 它表示时间是“过去的过去”。如:The patient had died when the doctor
arrived.
He had pressed the button before we
could stop him.
When I had finished my everyday
work, I did some gardening. 2.与某个时间段或时间点连用时, 一般过去时表示动作在这个时间发生, 而过去完成时表示动作在这个时间之前就已经完成。如:
He learned Russian during his stay in Russia.
He had already learned Russian during his stay in Russia.He said that he ________ (see) you before.had seenBy last year they _________ ( learn ) 2,000 words.had learnt1. 他说他以前见过你。2. 到去年为止他们已经学了2000个单词了。3. 到了六点钟为止,他们已经工作了八小时了。
By six o’clock they __________(work) for eight hours.
4. 我到广州时,他在那里很长时间了。
When I came to GZ , he ________ (be) there for a long time.had workedhad beenhad lived5. 到上个月中旬我们在北京住了有五年时间了。
By the middle of last month we ________(live) in Beijing for five years.
6. 她到家之前她的孩子已经睡着了。
When she got home her children ________ (sleep).had slept7. 在他们到达之前电影已经开始了。
Before they arrived here the film ___ already ______ (start).hadstarted1. I went to Tom’s house but he ________ (go) out.
2. Annie told me that his father ________ ( go ) to Paris and he __________ ( come ) back in a few days.
3. My friend ______ (buy) the car two years ago. had gonehad gonewould comebought