分析 A good sleep helps you relieve physical and mental stress while insufficient sleep may lead to various diseases.
解答 A good sleep helps you relieve physical and mental stress while insufficient sleep may lead to various diseases.
这是对睡眠质量的一种看法,所以用一般现在时.
本句重点考查连词while的用法,while表示对比关系,引导状语从句,表示同类事物之间的对比,常译为"然而,可是".help sb (to)do sth帮助某人做某事,relieve physical and mental stress释放身心压力; lead to导致.
点评 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.
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还有以下几种常见用法:
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.
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