时间状语从句 | 玄数

2018-12-28

SAT

It takes a copy machine 6 minutes to complete a certain copy job. How many minutes until the copy machine is finished with the job after 2/3 of the job has been completed?

A. 2 minutes
B. 2.5 minutes
C. 3 minutes
D. 3.5 minutes
E. 4 minutes
Answer
A. 复印机需要6分钟才能完成某个复印作业. 完成作业的2/3之后, 复印机完成作业还需要多少分钟?

一、状语和时间状语从句的对比

在句子中作状语的从句叫状语从句,时间状语从句是动作与时间先后顺序有关的状语从句

1.  简单句中的状语

He runs fast. …………… 他跑得快。
The book is very interesting. …………… 这本书很有趣。

2.  时间状语从句

He ran as soon as   he saw the headmaster.
主语 谓语 引导词 (主语 + 谓语 + 宾语)
They had finished all the food before    I arrived!
主语 谓语 宾语 引导词 (主语 + 谓语)

he saw the headmaster 和 I arrived 是主谓结构完整的语句,通过 as soon as 和 before 来引导,并体现时间先后顺序。

二、引导连词

引导时间状语从句的连词有when、 while、 as、 since、 before、 after、 as soon as、 till、 until

1.  when、 while、 as 都可以表示“当 … 时” ,有时可互换。 也有差别:while 用于延续性动作的动词,表示的时间较长,有时会有对比的意思;as 用于时间较短的情景,或者表示“一边 … 一边”

They were listening the music when I came in.   …………… 当我进来时她们正在听音乐。
When I got to the cinema, the film had begun. …………… 当我到电影院时,电影已经开了。
 
I’ll take care of your children while you are away. …………… 你不在时我会照顾你的孩子的。
The boys were playing football, while the girls were reading in classroom.
男孩们在踢足球而女孩们在教室读书。
 
As she left the room she remembered that book. …………… 她离开房间时想起了那本书。
As we walked, we talked. …………… 我们边走边谈。

2.  since:自 … 以来,表示自过去的某一个时间到目前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,动词要用延续动词;还用于 It is … since … 从句

Lily has learned to play violin since she was five. …………… 莉莉五岁时就学习拉小提琴了。
It is many years since Magellan start first global navigation.
自从麦哲伦开始首次环球航行以来,已有很多年了。

3.  before:在 … 之前, after:在 … 之后

They had finished all the food before I arrived!…………. 在我来之前他们已吃完所有东西了!
What are you going to do after you finished college? …………… 大学毕业后你打算做什么?

4.  till、until:直到 … ,可以互换

The baby cried and cried till his mother come back. …………… 这个宝宝哭啊哭直到妈妈回来。
I stood there until the plane had disappeared in the sky. 我站在那儿知道飞机消失于天空中。

5.  as soon as

The boy went out as soon as he finished his homework. ………… 那男孩一做完作业就外出了。
He ran as soon as he saw the headmaster. …………… 一见到校长他就跑了。

时间状语从句