as在-------期间,当----的时候”引导时间状语从句.注意与when、 while的用法区别。 ﻫ①下列情形时,只用as, 而不用when或while。
1)用于表示同一个人的两种动作交替进行,指一边----一边. 如: ﻫThe girl sings as she goes to school. ﻫHe looked behind occasionally as he went forward in the forest. ﻫ2)表示两个同步发生的动作或行为,意思是随着-----: ﻫAs time went on / by, she became more and more beautiful . ﻫAs children get older, they become more and more interested in everything. ﻫ3):I watched her as she read the book. ﻫI thought of it just as you opened your mouth. ﻫJust as the flying worm hit her face, she gave a loud cry. ﻫ4):
As a young man, he was active in sports. ﻫ②when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。如:When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2hours. ﻫ③ while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work. Play while you play.
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
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