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when, while, as 1.W__h_i_le_/_A__s_/_W__h_e_n_ we were talking, Mr.
Smiths came in. 2._W_h_e_n_ they came home, I was cooking dinner. 3. I was about to go to bed _______ I heard
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Before的用法 It will be half a year before I come back.
it will be +一段时间 before......多久之后才...
It won’t be half a year before we meet again.
2. every time, next/last/each time, the first time, the moment, the minute, the instant
3. immediately, instantly, directly 4. hardly…when, no sooner…than, scarcely…when
Adverbial Clauses
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判断下列ቤተ መጻሕፍቲ ባይዱ语从句的种类
1.While I was wondering at this, our schoolmaster
took his place. (
)
时间
2. Where there is a will, there is a way. (
)
3. N地ow点that/Since everybody is here, let’s begin
own son. (
)
• 9.He woke up as suddenly方a式s he had fallen
asleep. (
)
比较 3
一个句__子__在复合句中用作状语时,在语法上叫 状语从句。从句由___从__属__连词、__名__词__词__组或 ___副__词__引导。 状语从句可分为：1) __时__间__ 2) ___地__点____
someone knocked at the door. when 4. ________ we were watching TV, he was
stuWdhyinleg. 5. He is fat _______ his brother is thin. 6. ______ she swanhgil,etears ran down her face.
• 6. As long as yo结u d果on’t lose heart, you’ll
succeed. ( )
• 7. Try as he might, h条e c件ould not find a job.
()
• 8. The o让ld步lady treats the boy as if he were his
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（2）可用作并列连词，其意义为“那时， 这时”，相当于and at this/that time。 常用于句式：
Somebody was doing something when… Sb. was about to do sth. when… (刚要……这时突然……)
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2、连接词while的用法 （1） while意思是“当……的时候”或“在 某一段时间内”，引导的从句动作必须是 持续性的，侧重主句动作和从句动作相对 比。 People don’t talk so loudly while others are working. （2）从句和主句的谓语动词都为延续性动词 时, 只能用while; while还可作并列连词,表 示”而”.
3) ___原__因_ 4) _____目__的__ 5) ___结__果__ 6) ____条__件___ 7) ___方__式__ 8) _____比__较__ 9) ___让__步__等
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一. 时间状语从句的引导词 1. when, while , as, before, after, until, till, since, ever since, once, as soon as ，
(3) As 还能表示“一边……一边”，如： He looked behind from time to time as he went.
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4．如果主句表示的是短暂动作，而从 句用延续性动作的进行时态表示在 一段时间内正在进行的动作时， when, while与as 可互换使用。如： When/While/As I was walking down the street, I came across an old friend of mine.
our meeting. （ ）
4. I’ll speak slowly so that you can原u因nderstand me. ( )
目的
2
5. So clever was he a student that he was able to
work out all the difficult problems. ( )
I was reading while he was watching TV.
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3．as 的用法：
(1) as 着重强调主句和从句的动作同时或几乎 同时发生，如： The students rose as the teacher entered the classroom. (2)as还可以表示“随着……”，如： As time goes by, it is getting colder and colder.
As
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连接词when、while、as的用法小结 1、when 的用法： （1）when引导的时间状语从句的谓语动词 可以是延续的，也可以是表短暂性动作的 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。如： When the film ended, the people went back. When I lived there, I used to go to the seashore on Sundays.