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中考状语从句知识点:时间状语从句

2018-07-10 17:06:02  来源:西安爱智康

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  要点——时间状语从句,由以下连词引导:


  when while as after before as soon as since till /until by the time 在时间状语从句中,要注意时态一致。一般情况下主句是将来时的时候,从句要用一般现在时。


  1.when当……的时候


  Mozart started writing music when he was four years old.


  (当)莫扎特的时候,开始写音乐作品。


  2.while当……时


  He visited a lot of places while he was traveling.


  他在旅途中参观了许多地方。


  3.as在。。。的同时;一边……一边……


  He smiled as he stood up.


  他一边站起来一边笑着。


  4.after在……之后


  He left the classroom after he had finished his homework the other day.


  前几天做完功课之后回的家。


  5.before 在……之前


  Mr. Brown had worked in a bank for a year before he came here.


  布朗先生来这之前已经在一家银行里工作一年了。


  6.as soon as 一……就……


  We began to work as soon as we got there.


  我们一到那就开始工作。


  I will write to you as soon as I get home.


  我一到家就给你写信。


  7.since 自。。。以来 到现在


  表示自过去的一个起点时间到目前(说话时间)为止的一段持续时间。主句一般用现在完成时,从句用一般过去时。


  Mr GREen has taught in that school since he came to China three years ago.


  自格林先生来中国以来,他就在这所学校教书。


  (还可以用作介词,本句从句还可以用短语:since three years ago(自三年前以来)表示。)


  8 till /until


  都可以作连词,连接时间状语,也可以作介词,与其它词构成介词短语,在句中作状语。


  They walked till /until it was dark.


  他们一直走到天黑。


  Xiao Ming didn’t leave home till / until his father came back.


  小明直到他爸爸回来才离开家。


  9. by the time 到。。。为止 (所在句子的主句应用完成时)


  By the time he gets there , his father has already gone.


  他到家的时候,他爸爸已经走了。


  By the time I got to school, the class had already began.


  我到校时,已经开始上课了。


  难点——as when while的辨析


  as when while都表示主、从句动作同时发生,三者差异如下:


  表示“一边。。。一边"的意思


  as 强调两个动作同时进行,并表示对比时


  用于发生时间较段时


  when 1、还可以表示从句动词的动作在主几句动词的动作"之前 "或"之后"发生。


  2、when=and then; at that moment (正在那个时候)


  while


  1、用于时间较长时


  2、 强调两个动作同时进行,并表示对比时


  有时这三个连词可以互换,有时不可以。


  It was raining hard when (as) I got there.


  我到那里时,正在下大雨。 ( 动作同时发生,when可换为as, 但不能换为while,因为get是点动词.)


  When I had read the article, he called me.


  我看完这篇文章之后,她给我打了电话。( 从句动作发生在主句之前,注意时态表达,只能用when )


  When I got to the cinema, the film had begun.


  (当)我到了电影院时,电影已经开演了。(从句的动作发生在主句之后,只能用when,并要注意时态)


  He was about to leave, when the telephone rang.


  他正要离开,忽然电话响了。( 此时不能放在句首。主句动词一般表达 “正在” “即将”.


  while, as不能代替 ) 考点


  She thought I was talking about her daughter, while, in fact, I was talking about my daughter.


  他以为我在谈她女儿,然而,实际上在谈论我女儿。(表转折,对比,when, as都不能代替它) 考点


  lWhile the alien was buying a souvenir, the girl called the police.


  外星人买纪念品时,那女孩给警察打了电话。(表示主句,从句的动作同时发生,while后引导的状语从句的动词必须是延续动词不能是点动词,因为它表示较长时间)考点


  Mother was worried BECause little Alice was ill, especially as (when/ while) father was away.


  妈妈担心,因为小爱丽丝病了,特别是他父亲不在家的时候。(此时as ,when, while可通用)


  知识扩展


  1. It is since从。。。以来多长时间了(因为since +从句或名词,表示一段时间)


  It is five years since we met last time.从我们上次见面已经五年了。


  2. It is +before…(。。。才)


  It was a long time before I went to sleep again.


  过了很长时间我才睡着。


  It was an hour before(=until) the police arrived.


  过了一个小时,警察才来。

  标签: 中考 状语 从句 知识点 时间
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