when-的用法

2023-11-24 10:36:27   文档大全网     [ 字体: ] [ 阅读: ]

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用法,when


when 的用法

一、when 用作副词。

1 用作疑问副词,引导特殊疑问句。(什么时候,何时 [at what time 例如:

When will you come to see me?

When are they going to visit the Great Wall

2 用作连接副词,通常用来引导名词性从句[主语从句、表语从句、同位语从句、宾语从句]及起名词作用的“ when +动词不定式结构。(什么时候,何时 [at which on which ])例如: When he comes is not known [主语从句] The morning is when I am busiest. [表语从句]

I have no idea when the game will begin. [同位语从句

cf I still remember the day when I first came to Beijing [定语从句] I don't know when the plane takes off [宾语从句] I don’t know when to leave for London [宾语]

3. 用作关系副词,引导限定性定语从句和非限定性定语从句。(在的时候 [at/on/in/during which])例如:

Do you still remember the days when we stayed in America? The day will come soon when the Chinese astronauts will go to the moon

It happened ten years ago when I was a child.

We will go to the countryside at the beginning of June when the summer harvest will start. . when 用作连词。

1 用作从属连词,意为……的时候[at the time when ,引导时间状语从句。例如:

They learned a lot from the peasants when they stayed in the village It was snowing when he arrived at the station

【点津】如果 when 引导的从句中的主语和主句中的主语一致,且从句中的谓语动词是“ be +分词"或从句主语是 it be 动词及其主语常可省略.例如:

When he was asked why he was late, he made no answer. I’ll tell him about it when( it is possible

2 用作从属连词,意为…………”,引导时间状语从句.immediately after]例如:

We will stand up when the teacher comes into the classroom 老师一进教室我们就起立.

Fire the rockets when I give the signal.

3. 用作从属连词,意为还没 / 刚刚/刚一……”,引导时间状语从句。immediately after例如:

I had hardly opened the door when he came in. 我刚一开门,他就进来了。

I had not been reading for half an hour when I heard someone call my name

【点津】hardly…whenno sooner…than的结构要注意三点:意思为AB“A句通常用完成时态;hardly no sooner 位于句首时要注意部分倒装.

4. 用作从属连词,意为倘若,如果,表示条件。例如:

Turn off the switch when anything goes wrong with the machine 如果机器发生故障,就把电源关上。

He will be likely to recover when he is operated on 5 用作从属连词,意为既然,尽管",表示让步。例如:

Why use metal when you can use plastic?既然能用塑料,为什么用金属? They kept trying when they knew it was hopeless 尽管他们知道那件事没有希望,可是他们还在不断地努力。

6. 用作并列连词,意为在那时,届时;就在这时",表示时间.这时主句中可以用过去进行时,过去完成时或“ was/were about to do sth 结构。 Last night I was about to go to bed when the phone rang I was cooking in the kitchen when someone knocked at the door He had just finished the book when supper was served.

7. 用作并列连词,意为虽然、然而、可是”,表示转折。例如: He usually walks to work when he might take a bus. 虽然他可以坐公共汽车上班,但他却常常步行上班。

I had only twenty dollars when I needed thirty to buy the dictionary.我需 30 美元买那本字典,可是我只有20美元。 8. 用作并列连词,意为而、却,表示对比。例如:

How can he say that everything is fine when it’s obvious that it is not 怎能说一切都好呢?情况显然不是那样。 . when 用作代词which time]

when 作为代词常常位于介词之后,意为那时,什么时候。例如: Since when have you been studying Japanese?

【点津】since when 作引导词时是介词since+关系代词when" 结构,when意为which timesince when常引导非限制性定语从句,从应用完成时态。

I came here in 1949, since when I have been engaged in this work 1949年到这里,从那时起我就担任这项工作

We came back on Tuesday, since when we have been working in the repair shop

We came a week ago since when the weather has been bad 四、when 还可用作名词,前面常常用定冠词 the the when 表示事件发生的时间,常常与 the where the how 并列使用。

He told the police the when and the how of the accident. 他告诉警察事故发生的时间及发生的原委。 [巩固练习]

1. I remember ______ this used to be a quiet village. A when B how C. where D what

2. Why do you want a new job _____ you've got such a good one already A. that B where C. which D. when

3 It was an exciting moment for these football fans this year, ______ for the first time in years their team won the World Cup A that B. while C which D when

4 We are living in an age _______ many things are done on computer. A which B that C where D when

5. The reporter said that the UFO ______ east to west when he saw it A. was travelling B. travelled C had been travelling D was to travel

6. ______ got into the room _________ the telephone rang A. He hardly had; then B Hardly had he when C. He had not; than D. Not had he; when 7 --- Can I join your club, Dad? --- You can when you _______ a bit older. A. get B. will got C are getting D will have got

8. I shall never forget those days ________ I lived in the countryside with the farmers ________ had a great effect on my life.

A. that which B. when which C which; that D when who 9 The film brought the hours back to me ______ I was taken good care of in that faraway village

A. until B. that C when D where

10. He was about to tell me the secret ______ someone patted him on the shoulder.

A as B. until C. while D when

11. My brother left school in 2005 ,and since then he ______in Beijing A lives B lived C. will live D. has lived

12. Tom left Shanghai for London on May 5 since___I have never called him up.

A when B then C. while D that Key

1 ADDDA 6 BABCD 11 DA


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