since 和 for 的用法
since 和 for 的用法(用于现在完成时)表示过去已经开始持续到现在的动作或状态常用的时间状语有：for, since, how long, so far, these days等。1. since : a).since +时间点年代 时刻数 一段时间+ago b).现在完成时：主句(主语+have/has +延续性动词的过去分词)+ since +从句一般过去时 c) Its +时间段+since +短暂性动词的过去式d).时间段+has passed +since +短暂性动词的过去式 for +一段时间练习：用since和for填空1) _ two years2) _ two years ago3) _ last month 4) _ 19995) _ yesterday6) _ 4 oclock7) _ 4 hours8) _ an hour ago9) _ we were children 10) _ lunch time11) _ she left here12). He has lived in Nanjing _ the year before last.13). Ive known him _ we were children.14). Our teacher has studied Japanese _ three years.15). She has been away from the city _ about ten years.16). Its about ten years _ she left the city.2. for: for +一段时间= since +一段时间+ ago3. 与时间段连用时，短暂性动词应改为相应的延续性动词。1) come/go to - be at /in 2)leave -be away from 3)buy -have 4) borrow /lend -keep 4)open -be open 5)close-be closed 6) die-be dead 7) start/begin -be on 8) join-be in /be a member of /be a soldier 9) become be 10) fall asleep -be asleep 11)catch a cold have a cold 12) have/has gone to have been in 13) put on wear 14) finish/end be over 15) marry be married练习：.短暂性转换延续性1) His grandfather died two years ago . His grandfather has _ _ for two years. _two years _ his grandfather _. Two years _ _ _ his grandfather _.2) I became a teacher in 2000.I _ _ a teacher for _ _.3) The shop closed two hours ago.The shop _ _ _ for _ _.4) The door opened at six in the morning.The door _ _ _ for six hours.5) He left Fuzhou just now.He _ _ _ _ Fuzhou for five minutes.6) The film began two minutes ago.The film _ _ _ for _ _.How time flies! 7) They borrowed it last week.They _ _ it since _ _.8) I bought a pen two hours ago.I _ _ a pen for _ _.9) They married in 1990.They _ _ _since _.10) The meeting finished at six.The meeting _ _ _ for six hours.11) My brother joined the army two years ago.My brother _ _ a _ for _ _.My brother _ _ in _ _ for two years.12) I put on my glasses three years ago.I _ _ my glasses for _ _.选择1. Three years _since I _ you last time.A. have passed; metB. has passed; metC. passed; have met2. He has been here _ he left his hometown.A. since B. in C. for3. He _the English-Chinese dictionary for about twenty years，but it is still newWhat a careful man!A. has bought B. has borrowed C. has had4. -When did China _ the WTO?-China _ the WTO for several years.A. join; has been a member of B. join; has joined C. take part in; have been in5. How long have you _ the book?A. bought B. borrowed C. kept6. How time flies! Several years _ since we started our middle school life. We will keep the pleasant experiences in our minds.A. have passed B. has passed C.will pass7. Mr Fan _ this bike in 2005. He _ it for 10 years.A.bought, has bought B.has bought, has had C. bought, has had8. He _ in our school for 20 years and he _ here in 1977. A. has taught; came B. has taught; has come C. taught; came D. has teached; has came9.They are late. The film _ for five minutes. A. has begun B. has started C. has been on D. began10.We have been friends since _.A. five years B.five years ago C. five years before11.He has lived there _ 1992.A. since B. for C. after12.Mike _ the bike for a month.A. has bought B. has had C. has borrowed 13.He his home for ten yearsA. has left B. left from C. has been away from14.May _ the book for two weeks. A. borrowed B. lent C. kept D. bought15.I _ the job since 2002.A: have B: had C: have had16.He has been a student_two years. A in B on C after D for写出喜面动词的过去式和过去分词become begin break buy come do drink drive eat fall felt fly
