while用法
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一、while用法1
1.While作为并列连词,意思为“而,然而”,表前后意义上的对比或转折。
例如:There’s plenty of rain in the southeast,while there's little in the northeast.东南部雨量充足,而西北部则很少下雨。
Some people waste food while others haven't enough.有些人浪费粮食,然而有些人却吃不饱。
二、while用法2
另外while还有别的用法,while引导状语从句,有以下两种含义:
1.表示某个动作正在进行的同时,另一动作也在进行之中,这时主从句都用进行时态,有对同类的两个动作进行对比的意味。
如:While I was playing the piano,she was dancing.我在弹钢琴,她在跳舞。
While Jim is picking apples,Kate is carrying apples to the truck.吉姆正在摘苹果,凯特正在把苹果搬到卡车上去。
2.表示某个动作正在进行时,又发生了另一动作(该动作用一般过去时)。
如:While I was reading,I fell asleep.我读着读着就睡着了.
While we were swimming in the river,we saw a fish jump out of the water.我们正在河中游泳时,看见一条鱼跃出了水面.
三、while用法3
1.只要(=as long as)
There will be life while there is water and air.只要有空气和水,就会有生命。
2.而;然而〔表示对比〕
He is a driver while I'm a teacher.他是司机,而我是老师。
3.虽然(=although);尽管〔表示让步〕
While I see what you say,I can't agree with you.虽然我能理解你说的话,但是我不能同意你。
4.用作名词,表示“一会儿或一段时间”,常与a,the或this等连用。
如:Just wait a while and then I will help you.等一下,我会来帮你的.
Where have you been all this while?这一阵子你一直都在哪儿?
四、while用法4
while所引导的时间状语从句中的谓语动词只能是延续性动词。
例如:I met with an old friend of mine while(when) I was walking along the street.
五、while用法5
while 引导状语从句时,应注意以下几点:
1.while 引导的时间状语从句既可放在句首,也可放在句末;而 while 引导的让步状语从句一般放在句首,不放在句末。另外,也可以从意义上加以区分。
例如:While he was tired, he went on working。(虽然他累了,但他还是继续工作。)(while 引导让步状语从句)While he was tired, he would have a rest.(他累了就休息一会儿。)(while
引导时间状语从句)
2. while 引导让步状语从句时,如果从句的主语和主句的主语相同,那么从句的主语和谓语动词 be 都可以省略。
例如:While he was ill, he went there. (= While ill, he went there.)(虽然他有病,但他还是去那里了。)
3. while 和 when 都可以引导时间状语从句,但应注意:while 引导的时间状语从句中的谓语动词必须是延续性的动词;而 when 引导的时间状语从句中的谓语动词既可以是延续性动词,也可以是非延续性动词。当时间状语从句中的谓语动词是延续性动词时,while 和 when
可以互相替换。
例如:While we were talking, the teacher came in.(我们正在谈话时,老师进来了。)
The bus had left when we arrived at the bus stop.(当我们到达车站时,公共汽车已经开走了。)(arrive 是非延续性动词,因此,此句中的 when 不能用 while 替换。)When /
While we were having a meeting, our teacher came in.(我们正在开会时,老师走了进来。)(have
是延续性动词,因此,句中的 when 可以用 while 替换。)
4. while 引导的状语从句还可以表示“某个动作正在进行的同时,另一个动作也在进行之中”。
例如:While the teacher was speaking, the students were listening.(老师讲课时,学生们在听。)
释义
conj.当……的时候;与……同时;而,然而(表示对比);尽管,虽然;直到……为止
n.一段时间;同时;在此期间
v.消磨时间
prep.(北英格兰)直到
adv.在……的时候