1、時間狀語從句用句子表達一件事情或一個行為發生的時間，這個句子就叫時間狀語從句。時間狀語從句根據其所表示的 時間不同，所使用的連詞也不同。下面我們一起來看一下幾個常見的時間狀語從句：1. when引導的從句：表示主句的動作和從句的動作同時發生，或從句的動作發生在主句動作之前。例如：I was goi ng out whe n a visitor came.(動詞動作同時發生。)我正要出門，有客人來訪。I shall tell her the good news whe n she comes.她來時，我將告訴她這個好消息。小試牛刀：I found mother cooki ng for me.

2、I got home.(when)He was liste ning to the radio whe n I home. (get)2. while引導的從句：表示 當過程中”，強調某一段時間內主句和從句中謂語動詞所表示的動作在同一時期發生。由于while從句表示一個持續的行為，所以從句中要用持續性動詞，并且持續性動詞常用進行時態。例如：Keep an eye on my little sister while I am away.我不在時，請照看一下我的小妹妹。While we were watching TV, Jim came in.我們看電視的時候，Jim 進來了。小試牛刀：It s

3、tarted to rai n. We were playi ng football.(while)Lucy was clea ning the room Lily was liste ning to music.3. as引導的時間狀語從句：表示當的時候；一邊 一邊；隨著”，其從句的主語與主句的主語往往是同一人或物。例如： She sang as she worked.她一邊工作一邊唱歌。=She was singing as she was work ing.I saw him as he was getti ng off the bus.正當他下公共汽車時，我看見了他。小試牛刀： we

4、walked, we talked.You will grow wiser you grow older.4. before引導的從句：一般表示主句的動作發生在從句動作之前。例如：I didn ' t know any English before I came here.我到這兒來之前，一點英語都不懂。例如：I had written my report before my father came back.小試牛刀： He bought the ticket he went to see the film.5. after引導的從句：表示主句的動作發生在從句動作之后。例如：Afte

5、r he locked the door, he left.他鎖上門后，就走了。After he had finished his work, he played a game of chess with his friend.他做完工作后，和朋友下了一盤棋。小試牛刀：I will go out to play basketball with you. I finish my homework.(after)He left the classroom he had fini shed his homework the other day.6. since引導的從句：表示 自從以來”，從句中的動

6、詞一般表示動作的起點，用過去時。主句中的動詞表 示動作延續的情況，一般用現在完成時。如果主句中的動詞表示的不是延續的動作而是表示目前的狀態，可用 一般現在時。例如： Since he met this good friend, he has made great progress in his studies.自從遇見了這個好朋友，他已在學習上取得了巨大的進步。例如：It is twenty years since she joined the Party.她入黨二十年了。(主句中的動詞表示的是狀態，用現在時。)小試牛刀：it is five years since we last time.

7、 (meet)Mr gree n has taught i n that school since he (come) to China three years ago.7. until引導的從句：表示一個動作持續到某一時刻。但表達的意思不同。必須用否定形式。(1) 表示 直到”，如果主句中的謂語動詞是延續性動詞時，用肯定或否定形式都可以，(2) 表示 直到才”，主句用否定式，從句用肯定。如果主句中的謂語動詞是瞬間動詞時,例如：They worked un til it was late.他們一直工作到天黑。She didn ' t go to bed until she finish

8、ed her homework.她寫完作業才睡覺。小試牛刀： All the people left. He waited.(until)He went to bed . his father came home.&as soon as引導的從句表示 一就”強調動作緊密相連。例如： As soon as she came to the classroom, she began to read English.她一至U教室，就開始讀英語。小試牛刀： We start to sin g. It''s 12 o"clock. (as soon as)9. by th

9、e time 至U。為止(所在句子的主句應用完成時)例如：By the time he gets there , his father has already gone.他到家的時候，他爸爸已經走了。小試牛刀：By the time I got to school, the class. (begin )我到校時，已經開始上課了。知識擴展1. it is +時間段+since+ 般過去時（從。以來多長時間了）例如：it is five years si nee we met last time. 從我們上次見面已經五年了。2. it is/ will be + 時間段 +before+ 一般現

10、在時 例如：it is a long time before I go to sleep .it was an hour before the police arrived.it was+ 時間段 +before+ 過了很長時間我才睡著。過了一個小時，警察才來。般過去時（。才）小試牛刀：It(be) ten years since we(leave) that city .It is reported that it may be two or three monthsit is possible to test this medici ne on ani malsHow long do yo

11、u think it will beChina sends a manned spaceship to the moon?3、when和while 的區別連詞區別所接動詞例句whe n主從句同時發生、 先后發生瞬間性動詞、 持續性動詞When you arrive in London, please give us a call.When he was hav ing his lun ch, he heard the door bell ring.as主從句同時發生、 一邊一邊、隨著持續性動詞As time went on, he grew more and more impatie nt.A

12、s we walked, we talked.while主從句同時發生 然而、既然持續性動詞While she was reading a novel, her mother was cooking the dinner. Some people waste food while other have n 'te no ugh.I' m going to the post office.While you ' re there, can you get me some stamps?4、巧記10個瞬間性動詞在學習以when和while引導的時間狀語從句時，用到了瞬間動詞

13、和延續動詞。常見的瞬間動詞有die（死）,come（來）,go（去），eave（離開）,arrive（到達）,begin（開始）,buy（買）,join（加入）,borrow（借進，借 出），return（歸還）等。這10個瞬間動詞可用兩句口訣來幫助記憶：開始離去，借來還，出生入死，買到家。注釋：1. "開始離去，借來還"為 begin,leave,go,borrow,come,return六詞；2. "出生入死，買到家"為join,die,buy,arrive 四詞。3. 各詞改為相應的延續動詞為：begin 宀be on, leave be away

14、 from, borrowkeep, go be, come be here, returnbe back,join tbe in, die be dead, buy have, arrivebe here 等。'5、狀語從句與主句的時態問題主句（過去進行時） 主句（一般過去時） 主句（一般過去時） 主句（過去進行時）1. 由when、while引導的時間狀語從句的時態：（主過從過）+when +從句（一般過去）+when +從句（過去進行時）+while +從句（過去進行時）+while +從句（過去進行時）注意：看動詞為短暫性動詞用一般過去時，動詞為延續性動詞則用過去進行時。小試牛

15、刀：Mother(cook ) supper when I (get) home yesterday.Last Sun day I (meet) Lin Hong whe n I (walk) in the street.When the students (have ) a meeting, the teacher (come) in.While Han Meimei (sweep) the floor, Lucy (carry) water.2. 由when、after、before、by the time 引導的時間狀語從句的時態：主句、從句的謂語動詞都已完成，則先發生的動作用過去完成時

16、，后發生的動作用一般過去時。例如： After he had finished his work, he played a game of chess with his friend.小試牛刀： When they (get) to the cinema last light, the film (start).I (go) out with my friends after I (finish) all the homework last night.3. 時間狀語從句與主句的時態不一致。(主將從現：主句用將來時，而時間狀語從句用一般現在時)小試牛刀： As soon as I reach

17、Can ada, I you up. (ring)I will call you as soon as I the result. (know)He(become) a solider whe n he(grow) up .He ( wait)until the rain.( stop)一、單項選擇。1 The meeti ng did n't startevery one was there.A. Because B. un til C. why D. if2 The boyto bedhis mother came in.A. went not; un tilB. did n

18、9;t go; after C. went; un tilD. did n't go; un til3. Hewait until the rain.A . won' t, will stopB . won' t, stop C . will, stopsD. will, will stop4. As soon as Janehere, I ' ll post the letter to MikeA. leaveB. will leaveC . leaves D . left5 . It was already five o ' clockwe got

19、home.A . whe n B . whileC . because D . if6. I ' m going to the post office. you ' re there, can you get me some stamps?A . AsB . While C . Because D . If7 . Joan and Mary haven ' t seen each otherthey left school five years ago.A . as B . beforeC . after D . si nee8 . I will let you kno

20、w about it as soon as Ithe n ews.A . will get B . getsC . got D . get9. Heback un til the workdone.8A. is n't; will beB. is n't; isC. won't be; will beD. won't be; is10. I call the police for help I saw the thief.A. while B. beforeC. as soon asD . after11 They did n't start the w

21、orktheir teacher came back.A. un tilB. whileC. as soon asD. if12. Tom will call me as soon as heShan ghai.A. arrives B. will reach C. arrives inD. get to13. I'm sure he'll come to see me before heBeiji ng.A. will leave B. is leavi ngC. leave D. leaves14. I will tell him the n ews as soon as

22、heback.A. come B. comes C. will comeD. came15.1 won't believe youI have see n it with my own eyes.A. before B. un tilC. afterD. whe n16. Hehomeshe was satisfiedhis an swer yesterday.A. did n't go; un til; withB. was n't go; after; toC. does n't go; before; withD. did n't go; un t

23、il; to二、用方框中的單詞填空。when 、before、 after 、as 、since、 while、 until 、as soon as1. Mum was making cookies in the kitche nthe teleph one rang.2. I was watching TVmy wife was cooking.3. He had worked in a factory for two yearshe went to college.4. I shall play chess with youI finish watching TV.5. He didn ' t get to the airportit was dark.6. She sangshe went along.7. I haven ' t heard from himhe went to America.8 . We found the books two dayshe had gone away.三，完成句子。1. 他進來時，我在吃飯。 ， I was eating.2. 我在那封信寄到之前去北京了。I had left for Beiji ng just .3. 當我在玩電腦游戲時，爸爸在聽音樂。Father was