當(dāng)前位置：when while 與 as用法講解
來(lái)源:本站原創(chuàng) 點(diǎn)擊率: 發(fā)布: 2013-4-3
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1,when表示“當(dāng)……的時(shí)候”。從句中既可用延續(xù)性動(dòng)詞，又可用非延續(xù)性動(dòng)詞，這些動(dòng)詞既可以表示動(dòng)作，又可表示狀態(tài)。從句中的動(dòng)作既可和主句的動(dòng)作同時(shí)發(fā)生，又可在主句的動(dòng)作之前或之后發(fā)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從句的主語(yǔ)與主句主語(yǔ)相同，謂語(yǔ)又是be動(dòng)詞，從句主語(yǔ)和be可以省略：當(dāng)when從句主語(yǔ)與主句主語(yǔ)相同時(shí)，用when加分詞可以替代狀語(yǔ)從句。如：
when（you are）in trouble, ask her for help.
when（i was）sleeping, i never heard a thing.
2，as
(1)表示"當(dāng)……時(shí)"、"和……同時(shí)"。常指從句的動(dòng)作未結(jié)束，主句中的動(dòng)作就已發(fā)生。從句中多用表示動(dòng)作的動(dòng)詞，而不用be動(dòng)詞或表示感覺(jué)、理解、知道這類動(dòng)詞。
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)用于平行的動(dòng)作中，表示"一面……一面……"。常指一個(gè)主語(yǔ)同時(shí)進(jìn)行兩個(gè)動(dòng)作。如：
he sang as he worked.
the students took notes as they listened.
3,while表示"在……的時(shí)候"、"在……期間"。它強(qiáng)調(diào)主句的動(dòng)作與從句的動(dòng)作同時(shí)發(fā)生或主句的動(dòng)作發(fā)生在從句的動(dòng)作過(guò)程中。while從句中必須是表示動(dòng)作或狀態(tài)的延續(xù)性動(dòng)詞。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.
閱讀上一篇：英語(yǔ)語(yǔ)法賓語(yǔ)從句的講解
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英語(yǔ)語(yǔ)法—過(guò)去將來(lái)時(shí)
表示過(guò)去的某時(shí)以后將要發(fā)生的動(dòng)作。但這個(gè)將來(lái)時(shí)間絕不會(huì)延伸到“現(xiàn)在”；而僅限于“過(guò)去時(shí)間區(qū)域內(nèi)”。由[詳細(xì)]
英語(yǔ)語(yǔ)法—過(guò)去將來(lái)時(shí)
表示過(guò)去的某時(shí)以后將要發(fā)生的動(dòng)作。但這個(gè)將來(lái)時(shí)間絕不會(huì)延伸到“現(xiàn)在”；而僅限于“過(guò)去時(shí)間區(qū)域內(nèi)”。由[詳細(xì)]
