状语从句在四、六级、研究生入学考试以及各类应试中是一项比较重要的测试内容。引导状语从句的是一些连词,它们的位置比较灵活,可以置于句首,也可以置于句末。现在和小编一起来看看时间状语从句的引导词吧!

(1) when引导的时间状语从句
①.when引导的时间状语从句,其动词既可以是延续性动作的动词,也可以是瞬间性动作的动词,而且可以表示主句的动作和从句的动作同时发生,或者从句的动作发生在主句的动作之前。如:
when you apply for a job, you must present your credentials.
当你申请工作时,你必须递交你的有关证件。(同时)
② when还可表示just then(正在那时,突然)的意思,此时其所引导的从句只放在主句之后。如:
we were about to start when it began to rain.
我们正要动身,突然天下起雨来。

(2) as引导的时间状语从句
as引导的时间状语从句其动词的动作是延续性的,而且侧重表示主句和从句的动作并相发生:
We were having breakfast as she was combing her hair.
她梳头时我们在吃早饭。

(3) while引导的时间状语从句
while表示“在某一段时间里”或“在……期间”,其所引导的从句的动作是延续性的,并侧重表示和主句的动作同时发生。如:
When the teacher paraphrased the text in English, the students listened attentively and took notes.
当老师用英语解释课文时,学生们聚精会神地听并做着笔记。
I can learn while I work.
我可以边工作边学习。

(4) before引导的时间状语从句
① before“在……之前”
I have finished my dissertation before my supervisor went abroad.
在我的导师出国之前,我已完成了我的学位论文。
② before“……之后才”
It may be many years before we meet again.
可能要过许多年我们才能再见了。

(5) as soon as/once/directly/the instant等引导的时间状语从句
as soon as 是最常见的表示“一……就”的从属连词,其他连词还有once,directly,immediately,instantly,the instant (that),the minute(that) ,the moment(that)等,它们通常都可与as soon as换用。如:
As soon as we got home, the telephone rang.
我们一到家,电话就响了。
I recognized her immediately I saw her.
我一看见她就认出她来了。
Directly the teacher came in everyone was quiet.
老师一进来,大家就静了下来。

(6) hardly...when/no sooner...than引导的时间状语从句
关联从属连词hardly/barely/scarcely...when和no sooner...than的意思是“刚……就”,它们所引导的从句中的谓语动词通常为过去完成时。如:
He had no sooner (no sooner had he)arrived home than he was asked to start on another journey.
他刚一到家,就又要他出另一次差。
No sooner had the words been spoken than he realized that he should have remained silent.
这些话刚一出口,他就意识到自己应该保持沉默。

(7) since引导的时间状语从句
在含有since引导的时间状语从句的复合句中,从句的谓语动词通常为一般过去时,主句的谓语动词通常为现在完成时、过去完成时和一般现在时: We’ve never met since we graduated from the college.
大学毕业后我们就再没见过面。
Great changes have taken place since you left.
你走了以后,这里发生了巨大变化。

(8) till/until引导的时间状语从句 till和until同义,作“直到……时(为止)”解,till多用于非正式文体,until多用于句首。如:
Donald will remain in college until(till) he finishes his Ph.D course.
唐纳德将留在学校直到完成他的博士学位课程。
I won’t go with you until(till) I finished my homework.
等我做完作业我才和你一起去。

(9) whenever/each time/every time引导的时间状语从句
whenever在引导时间状语从句时作“每当;每次”解,each time和every time与whenever同义,通常可以与它换用。如:
The roof leaks whenever it rains.
每逢下雨屋顶就漏雨。
Whenever certain chemicals are mixed together,heat is produced.
某些化学物质被混到一起时,就会产生热。
Whenever/ Every time/ Each time I met her, she was studying.
我每次看见她时,她总是在学习。