when while 與 as用法講解
來源:本站原創(chuàng) 點擊率: 發(fā)布: 2013-4-3
1,when表示“當……的時候”。從句中既可用延續(xù)性動詞,又可用非延續(xù)性動詞,這些動詞既可以表示動作,又可表示狀態(tài)。從句中的動作既可和主句的動作同時發(fā)生,又可在主句的動作之前或之后發(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從句的主語與主句主語相同,謂語又是be動詞,從句主語和be可以省略:當when從句主語與主句主語相同時,用when加分詞可以替代狀語從句。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……時"、"和……同時"。常指從句的動作未結束,主句中的動作就已發(fā)生。從句中多用表示動作的動詞,而不用be動詞或表示感覺、理解、知道這類動詞。
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)用于平行的動作中,表示"一面……一面……"。常指一個主語同時進行兩個動作。如:
he sang as he worked.
the students took notes as they listened.
3,while表示"在……的時候"、"在……期間"。它強調(diào)主句的動作與從句的動作同時發(fā)生或主句的動作發(fā)生在從句的動作過程中。while從句中必須是表示動作或狀態(tài)的延續(xù)性動詞。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:英語語法賓語從句的講解

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