状语从句
分类：（九大类）
时间、地点、原因、条件、让步、结果、目的、方式、比较。
Part 1 时间状语从句：
最常用的连接词：
When，while，as , before , after , as soon as, until, not until
次常见的连接词:
The moment\minute, immediately, hardly…when, no sooner than
问题一：
●We wew swimming in the lake_______suddenly the storm started.
A\when B\while C\until D\before
●He was about to tell me the secret ______someone patted him on the shoulder
A\as B\until C\while D\when
●-Did Jack come back early last night? -Yes,it was not yet 8:00 _____he arrived home. A\before B\when C\that D\until
●He was about halfway through his meal______a familiar voice came to his ears.
A\why B\where C\when D\while
一、时间状从中连接词when的用法小结：
1、when引导的时间状从的谓语动词可以是可延续的，也可以是表短暂性的动词，可用于主句和从句动作同时发生或从句动作先于主句动作。例：
When the film ended,the people went back.
When I lived there,I used to go to the seashore on Sundays.
2、可用作并列连词，其意义是“那时，这时”，相当于and at this\that time.常用于以下句式：
was about to do sth. … when…\
be (on the point of) doing sth. …when…(刚要…这时突然…)
e.g.I was about to stop pretending to being listening to the class to listen to what the teachers
said when Mr. Li shouted at me so loudly that the whole class can hear.
3、还可以表示原因“既然”，相当于since,considering that.如：
It was foolish of you to take a taxi when you could easily walk there in 5 minutes.
问题二：
●The cost of living in Glasgow is among the lowest in Britain,_____the quality of life is
probably one of the highest.
A\since B\when C\as D\while
●______I accept that he is not perfect,I do actually like the person.
A\While B\Since C\Before D\Unless
二、时间状从中连接词while 的用法小结：
1、while 引导的动作必须是持续性的，强调某一段时间，主从句动作同时发生，或主从句中的动作或事物在从句中的动作或事情的进展过程中发生。如：
Please don’t talk so loud while others are working.
2、while作为并列连词，意为“然而，却”，表示对比。
I was reading while my father was watching TV.
3、while可表示尽管,相当于although
I have to give up because of you while I like it so much.
问题3：
●_________I get older ,I get more optimistic.
●He hurried home,looking behind _____he went.
●______he was going out,it began to rain.
A\Since B\When C\As D\While
三、只用as,不用when或while的情况
1、用于表示同一个人的两种动作交替进行，指“一边…一边…”，如：
The girl sings as she goes to school.
2、表示两个同步发生的动作或行为，如：
As time went by,she became more and more beautiful.
3、表示两个动作紧跟着发生，如：
As he was going out,is began to rain,
4、接在名词后面表示某一个年龄段时。如：
As a young man, he was active in sports.
四、连接词when,while,as的用法区别:
1、while引导的时间状语从句的谓语动词必须是可持续的，而when引导的时间状语从句的谓语动词既可以是可持续的，也可以是表短暂性动作的动词。
When\While he was eating his breakfast,he heard the door bell rang.
When I stopped my car,a man came up to me.(while不可用)
2、从句动作发生在主句动作之前时，只能用when 引导，不可用while\as,如：
When you have finished your work,you may have a rest.
3、表示“随着……”,连词用as,不用when\while,如：
As the election approached,the violenve got worse.
4、如果主句表示的是短暂性的动作，从句用延续性动作的进行时态表示一段时间正在进行的动作时，三者可互相交换使用。如：
When\While\As I was walking down the street,I came across an old friend of mine.
五、其他引导时间状语从句的连接词：
1、一些词，如the moment\minute\instant,immediately,directly,instantly,hardly…when,no sooner…than等，也可因的一个时间状语从句，相当于as soon as的意思。如：
e.g.We will come across this situation the moment (when)your most important relatives leave you.
It is not wise that we stop our lesson immediately (when) the bell rings if we can’t finish our task.
2、一些含有time 的名词短语，如every\each\next time,by the time 等，以及the day\year,the morning等也可以引导一个时间状语从句。如：
e.g.So many thousands of people died everytime there was an outbreak.
The day he returned home,his father was already dead.
Next time you come ,please bring your ID card.
3、如果hardly 或no sooner或scarcely置于句首，句子必须用部分倒装结构。如：Hardly had I got home when it began to rain.
问题4：
-Was his father very strict with him when he was at school?-Yes,he has never praised him_______he became one of the top students in the class.
A、after B\unless C\until D\when