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1、状 语 从 句一 、时间状语从句 & when、while、As:当时候 1、 相同： （1）三个都可接两个一长一短的动作。表示较长的动作用过去进行时；表示较段的动作 用一班过去时。 eg：While/When/As I was walking down the street I noticed a police car in front of the bank（2）三者都可以与现在进行时表示将来的动作 eg：I hope you will think of me for a moment as/when/while I am taking my driving test。 （3）三者都可以来
2、连接两个同时进行的长动作，主从句都用过去式 eg：I watched her as she combed her hair. We sat watching them when/while they had a close game. 2、 不同： （1）不用 as 的场合：当表示将来的状态时，在口语时用 when，书面语中用 while eg： When you are eighteen，you can join in the army. -I am going to the post office. -_going there, can you get me some stamps. AA
3、s BWhile CBecause DIf （2）不用 While 的场合： $当从句中的动作是短暂性的(V 瞬),不用 While 而用 When/As eg：The clock was striking 12 when/as I came in $当两个短动作的动词同时发出时,用 As/When,不用 While eg：I thought of it just when/as you opened your mouth (3) 只用 as 的场合： $一边一边 eg：We sang as we worked He looked behind as he went along$as+a+n=
4、Whenwas+a+n eg：As a child, he could remember 100 Tang Poema= When he was a child, he could remember 100 Tang Poems $ 随着 eg：As time went on, his theory proved to be correct We do not necessarily grow wiser A we grow older Aas Bthan Cthat Dbecause (4)只用 When 的场合： $ be about to do + when(并列连词)+句子=when=
5、and just then 或 and suddenlyeg：I was about to go out when it rained hard $ was/were doing when +句子 eg：I was wandering through the streets when I caught sight of a tailors shop $ had not done +状语(时间)when +句子 eg：She had not been married many weeks when that mans younger mother saw her was struck by he
6、r beautyWe had not gone ten miles Sam decided he wanfad to go home (5)常用 While 场合： $ 当主句是过去进行时 eg：While John was writing a letter, I was watching TV $ While 表示对比时： eg：He likes music while I like sports $ While 表示尽管时 eg：While I understand your point of view, I do not share it _ I admit that there are
7、 problems, I do not think that they can not be solved AUnless BUntil CAs DWhile & Every time Each/Last/First time +从句, S+V 主 The next time (时间状语从句) _ I saw him, I thought him good and honest A At first time BAt first CFor the first time DThe first time & MomentThe instant +从句 As soon as 从句 The minut
8、e +(时间状语从句)一就 eg：The moment he saw the fire, he ran into the house & Noon sooner had S 主 + done/been + that + S +过HardlywhenScarelywhen & Since eg：It is two years since we last met each other separated Great changes have taken place since he visited China/its opening. It is eg：“It is ten year since
9、I enjoy myself.” Said he.=I have not enjoyed myself for ten years. It is three years, since he had a chance to go back. It is two weeks since, he was ill. & .before:a.主句动作发生在从句之前或者说主句动作已发生但从句动作还未发生但从句 动作还未发生,在之前 eg: Be a pupil before you became a teacher.We will have a further discussion before draw
10、 a conclusion.Usually scientist test a theory for a while _ they accept it as true.A. before B. after C. when D. because eg: Do not draw a condasion before you think it over. b. 在没有做之前(汉语是否定的,关于则是肯定式) 我们将做进一步的讨论,然后再作结论在你没有思考之前,别下结论 Let us talk all this over again _we made a final dicision. A. after
11、B. before C when D. while eg: He had gone home before I had time to say thank you.He hang up the phone before I could answer it.They decided to chose away before it caused more change. A. unless B. until C. before D. although He was forced into the room _he had time to realize what was happening. A.
12、 when B. after C. before D. as Eg: Three moths passed before I realized it.He was so interested in the book that he had read for three hours _he realize it. A. since B.as C. before D.until d. It was eg: It was many years before he got used to the new life here. e. It will b eg: It will not be long b
13、efore we graduate from high school.It will not be long man canderelop the solar made it serve mankind. A. since B. before C.when D. after Some scientists say that it may be five or six years _ it is possible to test this medicine on human patients. A. since B. before C. after D. when It is a long ti
14、me B. A. when he saw last you B. since he saw you last C. before he last you D.than he say you last & after, eg: After he graduated from University, he worked in a big company. I began to prepare the new lesson, _I had reciewed the old ones. A. before B. after C. until D. now that& until-eg: He wait
15、ed till/until/ his mother came back.eg: He did not work until/till his mother came back.C: Not until eg: Not until he was in Senior three did he realize the importance of learning English.He did not realize the importance of learning English until he was in senior three. B quite recently, women in t
16、hat part of the country did not take paid work outside their home. A. before B. Until C. From D. Since d. It was/is + not until eg: It was not until he was in Senior three that he realized the importance of learning English.二 条件状语从句If , unless, in case As long as=so long as On condition that=if eg: Once you unde
