求.when，while，各两题.(最好能表明答案和
编辑： admin 2017-01-03
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1.Much hard ________ he tried,he flailed to catch up with the first runner.
A.although B.as
C.while D.when
2.We were just ________ calling you up ________ you came in.
A.about; when B.on the point of; while
C.on the point of; when D.on the point of; as
3.Most animals have little connection with animals of a different kind,________ they hunt them for food.
A.if B.while
C.unless D.as
4.________ he thought he was helping us with the work,he was actually in the way.
A.Although B.Unless
C.Because D.When
5.Babies sleep l6 to l8 hours in every 24 hours,and they sleep less ________ they grow older.
A.while B.as
C.when D.after
6.I have been keeping the portrait ________ I can see it every day,as it always reminds me of my childhood in Paris.
A.since B.where
C.as D.if
1.B.因为as引导让步状语从句,要求将从句的表语或状语等放到句首.而although,while表示让步时,都用正常语序；另外,though引导的让步状语从句,其表语或状语等可提前也可不提前.
2.C.因为表示“正要做某事时,突然又发生另一件事”的句型是：was /were just about to do sth.when…did…或was /were just on the point of doing sth.when…did…
3.C.unless“除非、如果不”.句意是：大多数动物与其它不同种类的动物都没有什么联系,除非是把它们猎为食物.
4.A.句意是：虽然他认为他在帮我们做工,但事实上他是在挡事.
5.B.表示主、从句的谓语动词同时变化的“随着…”只能用as.
6.B.因为keep the portrait (把照片放在…)后面一定是指所放的“地方”了,所以用where (在…的地方) 引导一个地点状语从句.
如果还需要
提示：
When you are bored,you play PSP!
When I am sad,Iplay the guitar .
While my mom is watching out the window,I sneak out.
While the sun is falling ,I watch it .
As you known , I am a teacher.
As you though , this is correct.
类似问题
类似问题1：while,as,when 区别?[英语科目]
while,as,when 都可解释为“当…时候”,用来引导时间状语从句,但有区别：
1、while 意为 during the time that“在……期间”,表达一个“时间段”,不能表达“时间点”,从句的动词只限于持续性动词.例如：
One day while he was shopping in the supermarket,he saw his ex-wife with a man.
一天,他在超市购物时,他看到了他的前妻和一个男子在一起.
Strike while the iron is hot.
趁热打铁.
2、when 意为 at the time that“在…时”,多指“时间点”,例如：
When he returned from work,his wife was cooking.
他下班回家时,他的妻子正在做饭.
3、as 意为 at the same time that“正当……”或“与……同时”,它兼指“时间点”和“时间段”,从句的动词既可是短暂性动词,也可是持续性动词.例如：
The door bell rang as we were having breakfast.
正当我们吃饭的时候,门铃响了.
As the time went on,the weather got worse and worse.
随着时间的推移,天气越来越糟.
归纳：
总的说来,3者的功能区别大体可作如下描述：
while 为主句动作的发生划定一个时间的范围；
as 为主句动作的发生提供一个伴随的动作；
when 为主句动作的发生规定一个特定的时间.
类似问题2：when while as 区别[英语科目]
when,as,while这三个词都可以引出时间状语从句,它们的差别是：when 从句表示某时刻或一段时间,有“当……时”的意思；
as 从句表示进展过程,有“随着,一边……一边”的意思；
while 只表示一段持续的时间,有“在……的同时”的意思.
例如：
When he arrived home,it was just nine o'clock.
当他到家时,正是九点钟.
As he grew older,he became more intelligent.
随着他年龄的增长,他变得更有才智了.
While she was typing the letter,the telephone rang.
当她在用打字机打那封信时,电话响了.
类似问题3：as/when/while之区别,带例句.[英语科目]
while 后面接延续性行为,但这个动作肯定和主句动作时间不一样长.如：he was talking to me while he was watching the tv.应该说“看电视”比“谈话”时间长.而as通常两个动作一直相随,很可能时间相同.如：he was thinking of a question as watching the tv.这两个动作就是一直相随的.
as意为“一边……一边……”或“与……同时”,重在表示动作同时发生、伴随进行.while只指“时间段”,不指“时间点”,从句的动词只限于持续性动词.
1 从句表示"随时间推移"连词能用as,不用while.
As the day went on,the weather got worse.
日子一天天过去,天气越变越坏.
2 as引导短暂性动作的动词.
Just as I stopped my car,a man came up to me.
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when,as,while用法之异同
请看99年高考的一个选择题：
－I′m going to the post office.
－_____ you are there,can you buy me some stamps?
A．As B．while C．Because D．If
根据本题语境,选项C、D显然不合题意,故答案应在A、B之间选择.为什么正确答案为B而不是A呢?
先看when,as,while在引导时间状语从句时的主要用法：
when表示“当……的时候”.从句中既可用延续性动词,又可用非延续性动词,这些动词既可以表示动作,又可表示状态.从句中的动作既可和主句的动作同时发生,又可在主句的动作之前或之后发生.如：
When I came into the room,I found him lying there asleep.
Mary was having dinner when I saw her.
When you meet a word you don't know,consult the dictionary.
She was beautiful when she was a girl.
如果when从句的主语与主句主语相同,谓语又是be动词,从句主语和be可以省略：当when从句主语与主句主语相同时,用when加分词可以替代状语从句.如：
When（you are）in trouble,ask her for help.
When（I was）sleeping,I never heard a thing.
as表示"当……时""一面……一面","随着".其具体用法如下：
1、表示"当……时"、"和……同时".常指从句的动作未结束,主句中的动作就已发生.从句中多用表示动作的动词,而不用be动词或表示感觉、理解、知道这类动词.
As he stood there,he saw two men enter the bar.
She dropped the glass as she stood up.
As I was walking down the street,an American asked me for directions to the nearest station.
2、用于平行的动作中,表示"一面……一面……".常指一个主语同时进行两个动作.如：
He sang as he worked.
The students took notes as they listened.
3、用于平行发展的结构中,表示"随着……".常指一个行为是另一个行为的结果,或一种状态随另一种状态变化.句中的动词多表示状态的发展变化.
As the wind rose the noise increased.
As it grew darker it became colder.
As he grew older he became more confident.
While表示"在……的时候"、"在……期间".它强调主句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中.While从句中必须是表示动作或状态的延续性动词.如：
Never get on or off a bus while it is in motion.
The weather was fine while we were in Beijing.
She called while I was out.
1、如果主句的动作在从句的动作过程中发生,从句常用进行时.如：
While we were swimming someone stole our clothes.
Don′t talk so loud while others are working.
2、如果主句和从句主语相同,while加现在分词可代替状语从句.如：
We must strike while the iron is hot.
He took a bath while I was preparing dinner.
Come and pay a visit to the park while the flowers are in bloom.
通过以上分析我们可以看出,when,as,while引导时间状语从句时,侧重点有所不同.
1、When可指时间点,又可指时间段,从句中可用延续性动词,也可用非延续性动词.
2、While总是指一个时间段,从句中必须用延续性动词.
3、as多用于平行结构.表示两个动作同时发生：一个主语同时进行两个动作：一种状态随另一种状态的变化而变化.
4、表示主句的动作发生在从句的较长动作过程中,when,while,as均可使用.从句中为be动词时,多用when和while.谈论两个同时进行的长动作可用while；谈论两个平行动作或两种状态变化多用as.
再看文章开头所给的高考题,主句动词为buy,从句动词为be,不是两个平行动作,显然不应选项A,
类似问题4：一道关于when和while的选择题"_________did the bell ring?""________ we were having dinner,the bell rang."A.when;when B.when;whileC.while;while D.while;when答案是B,可我觉得A、B都对.when可以用来代替while不是么,它既可[英语科目]
B
when+短暂性动词
while+延续性或状态性动词
类似问题5：英语 while when as 的选择题（要求详尽答案） I am good at English －－－－－－－－－－－ he does well in Japanese ．A： while B：when [英语科目]
while为并列连词,连接并列分句,表示对比或对照.
when是从属连词,可以表时点或时段.作当...时候讲
as是从属连词,强调主从句动作同时进行.