状语从句讲解

发布 2021-05-14 08:30:28 阅读 2346

1.由when, while, as引导的时间状语从句。

例如: when you think you know nothing, then you begin to know something.当你以为自己一无所知的时候,你就是在开始知道一些事物了。

when truth is buried under the ground it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.当真理被埋在地下的时候,它在生长,它感到压抑,它蓄存着一种**性力量,一旦冒出,它就会炸破一切!

strike while the iron is hot. 趁热打铁。

will you watch my clothes while i h**e a swim. 我游泳的时候,请你照看一下我的衣服。

you can feel the air moving as your hand pushes through it. 当你的手在空气中挥动的时候,你就能感觉到空气在流动。

our headmaster laughed as she spoke.我们的校长一边谈一边笑。

when, while和as的区别。

when引导的从句的谓语动词可以是延续性的动词,又可以是瞬间动词。并且when有时表示“就在那时”。

例如: when she came in, i stopped eating.她进来时,我停止吃饭。(瞬间动词)

when i lived in the countryside, i used to carry some water for him.当我住在农村时,我常常为他担水。(延续性的动词)

we were about to le**e when he came in.我们就要离开,就在那时他进来了。(瞬间动词)

while引导的从句的谓语动词必须是延续性的,并强调主句和从句的动作同时发生(或者相对应)。并且while有时还可以表示对比。例如:

while my wife was reading the news*****, i was watching tv. (was reading是延续性的动词,was reading和was watching同时发生)

i like playing football while you like playing basketball.我喜欢踢足球,而你喜欢打篮球。(对比)

as表示“一边……一边”,as引导的动作是延续性的动作,一般用于主句和从句动作同时发生;as也可以强调“一先一后。例如:

we always sing as we walk.我们总是边走边唱。(as表示“一边……一边”)

as we was going out, it began to snow.当我们出门时,开始下雪了。(as强调句中两个动作紧接着先后发生,而不强调开始下雪的特定时间)

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

用于发生时间较短时

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。

lit 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。)

lwhen i had read the article, he called me.

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

lwhen 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)

lhe was about to le**e, when the telephone rang.

他正要离开,忽然**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

lshe 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)

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**。(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)

lmother 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)

2.由before和after引导的时间状语从句。

注意before引导的从句不再用否定式的谓语,并且当before引导的从句位于主句之后,有时译成“就,才”。还要注意主句和从句之间的时间关系。当主句用将来时,从句总是用现在时;如果before引导的从句谓语用的是过去时,则主句动词多用过去完成时,这样以便体现动作发生的先后。

after表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。例如:

it will be four days before they come back. 他们要过四天才能回来。

einstein almost knocked me down before he saw me.爱因斯坦几乎把我撞倒才看到我。

my father had left for canada just before the letter arrived.我父亲恰好在信到之前去加拿大了。

they had not been married four months before they were divorced. 他们结婚还不到四个月就离婚了。

after you think it over, please let me know what you decide.你仔细考虑过以后,告诉我你是怎样决定的。

after we had finished the work, we went home.完成工作之后,我们回家了。(从句用过去完成时,主句用一般过去时)

3.由till或until引导的时间状语从句。

till和until一般情况下两者可以互换,但是在强调句型中多用until。并且要注意的是:如果主句中的谓语动词是瞬时动词时,必须用否定形式;如果主句中的谓语动词是延续性动词时,用肯定或否定形式都可以,但表达的意思不同。

例如:i didn't go to bed until(till) my father came back.直到我父亲回来我才**睡觉。

it was not until the meeting was over that he began to teach me english.直到散会之后他才开始教我英语。

i worked until he came back.我工作到他回来为止。

i didn't work until he came back.他回来我这才开始工作。

please wait until i arrived.在我到达之前请等我。

4.由since引导的时间状语从句。

since引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词。一般情况下,从句谓语动词用一般过去时,而主句的谓语动词用现在完成时。但在it is +时间+since从句的句型中,主句多用一般现在时。

例如:i h**e been in beijing since you left. 自从你离开以来,我一直在北京了。

where h**e you been since i last saw you? 自上次我和你见面以后,你到**去了?

it is four years since my sister lived in beijing. 我妹妹不在北京住有四年了。

it is five months since our boss was in beijing.我们老板离开北京有五个月了。

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)

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