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1、Unit 4状语从句的引导词分 类连接付词（引导词 ）时间 状 语从句When, as, while, before, after, until, since, as soon as, hardlywhen-, no sooner.than , the moment, by the time, The first time,Every time原因状 语从句Because, since, now (that) , as , seeing(that) , considering (that), 地点状 语从句Where, wherever条件状 语从句If（假如） , unless, as(so
2、) long as, provided(that) , providing (that) , in case，once让步状 语从句While,although, though, as,even if (though), whether.or(not),whatever, whenever, wherever, whoever , whichever, however, no matter what ( when, who, which, how) as （虽然、尽管）目的状 语从句So that, in order that, lest（以免、唯恐） , for fear that （以免、
3、唯恐）结果状 语从句So, so that, sothat, suchthat方式状 语从句As（按照、和-一样）, just as, as if（ 似乎、好像是）=as though, the way（-的方式）比较状 语从句Asas, than , not soas, the more.the more表示时间的状语从句可由 when, as, while, whenever, after, before, till (until), since, once, as soon as ( 或 the moment ), by the time, no sooner than, hardly
4、(scarcely) when, every time 等引导。 futurepastthe show begins.We need another contestanta make-up artist rushed forward.he seated her on the stageAfternowfuturebeforenowpastbefore & after 1. Einstein almost knocked me down before he saw me. 2. It will be four days before they come back. 3. My father ha
5、d left for Canada just before the letter arrived. 4. After you think it over, please let me know what you decide. 5. After we had finished the work, we went homebefore和after的用法比较：nowfuturenowpastwhileShe sat on the edgeshe watched.pastfutureasthe audience clapped.“Right” shouted Lesterwhile & as whe
6、n, while, as表“时间”的区别1. when当 / 在.时(=at the time that)。 可表示瞬间、时间段，可与主从句所述动 作、事情同时发生，也可有先有后。 It was snowing when we got to the airport. （同时发生） When he got to Shanghai, the ship had already set off. （先后发生）2. while正当（正在）.时（=during the time that）表示同时进行的两个延续动词所 表示的动作同时发生。 Please write while I read.（=durin
7、g the time that）Some students were reading while others were writing.3. as 当.时（强调 at the same time） as 不指先后，而指并相发生，尤指短暂动 作或事件同时发生：As I looked, some one came near. as 还可说明两种正在发展或变化的情况：As I get older, I get more optimistic. 【注意】as, when 或while都可以引导时间较 长的“背景”情况。 As / When / While I was walking down the
8、 street, I saw something strange in the sky.pastnowfutureSinceMP3 players were introduced in 1997people have taken them everywhere.pastnowfutureuntil/tillFive minuteswe start filming.since & until/till since的用法：since表示从过去某一时间或动作、事情起到目前为止 ，“自.以 来”。1. 引导状语从句时，主句用现在完成时，从句中用一般 过去时。 自从他来到我们班以来,他的学习成绩提高了许
9、多.His study has improved a lot since he came to our class.2. 常用句型： It is (has been) + since +一般过去时自我开始学英语已有5年了(我已学了5年英语了) 。It is five years since I began to learn English.(I have learned English for five years.)1 I didnt go to bed until my father came back. 2 I worked until he came back. 3 I didnt w
10、ork until he came back. 主句中的谓语动词是瞬时动词时，必须用否定形 式；如果主句中的谓语动词是延续性动词时，用 肯定或否定形式都可以，但表达的意思不同。 until的用法：till和until的用法比较：till和until一般情况下两者可以互换，但是 在强调句型中多用until。I didnt go to bed until（till） my father came back. It was not until the meeting was over that he began to teach me English.1. 由as soon as, immediat
11、ely, directly, instantly, the moment, the second, the instant, the minute, the while 等引导的时间状语从句，这些连词都 表示“一就”。例如： I will go there directly I have finished my breakfast. The moment I heard the news, I hastened to the spot. 【注意】hardly (scarcely, rarely)when / before, no soonerthan相当于as soon as之意 。主句用过去
12、完成时，从句用一般过去时。当 hardly, scarcely, rarely和no sooner位于句首时 ，主句应用倒装语序。例如： He had no sooner arrived home than he was asked to start on another journey. No sooner had the sun shown itself above the horizon than he got out of bed to start working.2. 由each time/every time/next time/last time/every time/the f
13、irst time,和whenever/no matter when引导的时间状语从句。例如： Each time he came to Harbin, he would call on me. Whenever that man says “To tell the truth”, I suspect that hes about to tell a lie.No matter when she says to tell the truth, I suspect that hes about to tell a lie.Choose the best answers. 1. I was wal
14、king _ I heard a cry for help.A. while B. when C. as soon as D. until 2. _ the day went on, the weather got worse.A. Before B. AfterC. As D. While 3. I called him _ I got to his hometown.A. until B. whileC. as soon as D. sinceB CC4. He waited _ all the other people left the station.A. after B. since
15、 C. until D. not until5. He fell off the bike _ he knew what had happened.A. as soon as B. before C. until D. whileCB6. Please look after it for me _ I am away.A. while B. until C. as D. after 7. While his father was singing, he _ the piano.A. played B. was playing C. playing D. plays 8. I saw the accident when I _ past the museum.A. walked B. walking C. was walking D. walkCBAFill in the proper conjunctions.1. _
