现在完成时Since和for的用法
中考英语：since与for用法
现在完成时态中的since 与for1. 实例：We have studied English for more than 2 years. 我们学英语已有两年多时间了。
She has been ill since last Sunday. 她从上周星期天一直病到现在。
2. 用法说明：(1) 介词for 短语表示一个时间段，指某个动作或情况到现在为止已持续了多久，提问时用how long；since 作为介词，接一个时间名词，作为连词，引导一个时间状语从句(从句动词一般是短暂性动词)，since 表示“自…以来”，指某个动作或情况从过去某一点时间一直持续到现在，因此，与for 或since 引出的时间状语连用的句子(或主语)谓语动词必须是持续性的(如上面两句中的动词study 和be)(2) 英语中有些动词的意义不能持续，表示的是一瞬间就结束的动作，这些动词被称为非持续性动词或短暂性动词，常见的如come, leave, go, lose, see, begin, start, arrive, bec ome, die, buy, borrow, close, join, reach, fall, get up 等。
这类动词可以用于完成时态，但在肯定句中不能与表示动作延续的时间状语for 或since 短语连用。
如：正：He has come back. 他已回来。
误：He has come back for three days.若要表示“他回来已三天了”这样的意思，可以将动词改为延续性动词，或改变时间状语，或改用别的句型等，如译为：He has been back for three days. (改变谓语动词)He has been back since three days ago. (改变谓语动词)He came back three days ago. (改变时间状语及动词时态)It’s three days since he came back. (改变句型)(3) 非持续性动词用于完成时态，在肯定句中不能与for 或since引出的短语(或句子)连用，但在否定句中是可以的，因为一个非延续性动词一旦被否定即成为状态，而状态总是可以延续的。
现在完成时以及for,since的用法
for +一段时间表示时间的持续 强调一段时间 have / has been + doing sth + since +过去的时间点 表示“自从过去某一时间 点以来” 强调动作或状态一直延续到现在 since + 从句 (一般过去时) 表示从过去开始一直持续到现在的动作，并有可能持续下去．与过去时的比较：1.I watched TV for three hours.我看了三小时的电视．（我现在没有看电视了）2.I have been watching TV for three hours. 我看了三小时的电视．（我现在仍然在看电视）一．用for 或者since 填空。
填空。
1.They have been learning Chinese since they came to China. 2. I haven’t seen her ___for __ a long me. 3. He has been living here _since____ 2001. 4. She has been doing her homework __for__two hours. 5. It’s 5 years __since___ we le school. 6. – How long has Mary been a teacher? – __since___ two years ago. 7.I have been prac cing the piano _since ___ 10:30. 8.Maricia has been running __for__ 15 minutes. 9.Sarah has been sleeping ___since__ 9:00. 10.Dale has been talking on the phone __for___5 minutes. 11.Louie has been studying Chinese __since__ he was 6 years old.. 12.I have been watching you __for__10 minutes. 二．单项选择题。
英语 现在完成时Since和for的用法
现在完成时Since和for的用法Since 和for 的用法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。
Since+过去点的时间，for+一段时间(数词+量词)，此划线部分用how long提问。
一、since短语或从句表示过去的动作延续至今，since之后的时间为一点。
如：Mr. Smith has worked here since 1984. 1984年以来，史密斯先生一直在这工作。
He’s learned about 5,000 English words since he went to college. 他上大学以来大约学了五千个英语单词。
二、for短语表示动作延续多长时间，for的宾语为时间段。
如：We have known each other for twenty years. 我们认识有二十年了。
I haven’t seen her for a long time. 我好久没有见到她了。
练习：用since和for填空1) ______ two years 2) _______ two years ago 3) _______ last month4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children10) _____ lunch time 11) ______ she left here1. He has lived in Nanjing ________ the year before last.2. I’ve known him __________ we were children.3. Our teacher has studied Japanese _________ three years.4. She has been away from the city ___________ about ten years.5. It’s about ten years __________she left the city.2.短暂性转换延续性①arrive at/in sw. get to/reach sw. come/go/move to sw.→ be in sw./at school/at home/on the farm/be here/be there1) He got to Beijing five minutes ago.He ________ _________ _________ Beijing for _________ _________.2) I moved to the USA last year.I ________ ________ __________ the USA since __________ __________.3) I went home yesterday.I _______ ________ _________ home for _________ __________.4) They came here last week.They _________ _________ here since _________ __________.②come/go back, return → be back come/go out → be out1) He came out two years ago.He _________ __________ _________ for __________ __________.2) We return to Fuzhou yesterday.We ________ ________ _________ to Fuzhou since __________.③become → be1) I became a teacher in 2000.I ________ __________ a teacher for _________ _________.2) The river became dirty last year.The river _________ _________ dirty for _________ __________.④close → be closed open → be open1) The shop closed two hours ago.The shop ________ _________ _________ for _________ _________.2) The door opened at six in the morning.The door ________ ________ ________ for six hours.⑤get up → be up die → be deadleave sw. → be away from sw.fall asleep/get tot sleep → be asleepfinish/end → be over marry → be married1) I got up two hours ago.I ________ ________ ________ since ________ ________.2) He left Fuzhou just now.He _______ ________ ________ _________ Fuzhou for five minutes.3) My grandpa died in 2002.My grandpa _______ _______ ________for _______ ________.4) The meeting finished at six.The meeting ________ ______ ______ for six hours.5) I got to sleep two hours ago.I ________ _________ _________ since _________ __________.6) They married in 1990.They ________ _________ __________since _________.⑥start/begin to do sth. → do sth. begin → be on1) I began to teach at this school in 1995.I ____ ____ at this school since ____.2) The film began two minutes ago.The film ____ ____ ____ for ____ ____.⑦borrow → keep lose → not have buy → have put on → wearcatch/get a cold → have a cold get to know → know1) They borrowed it last week.They _________ _________ it since __________ __________.2) I bought a pen two hours ago.I _________ _________ a pen for ________ __________.3) I got to know him last year.I _________ __________ him since __________ __________.4) I put on my glasses three years ago.I __________ __________ my glasses for _________ _________.⑧have/has gone to → have been in1) He has gone to Beijing.He ____ ____ _____ Beijing for two days.⑨join the league/the Party/the army→ be a league/a Party member/a soldier→ be a membe r of the league/the Party→ be in the league/the Party/the army1) He joined the league in 2002.He ________ _________ a _________ _________ for two years.He ________ __________ a __________ ___________ the __________ for two years.He ____________ ___________ ___________ the league for two years.2) My brother joined the army two years ago.My brother __________ __________ a ___________ for ___________ ___________. My brother ___________ ___________ in ____________ ___________ for two years.3.汉译英1)这本字典我已买了三年了。
Since-和-for-的用法及区别
Since 和 for 的用法及区别：一，since 的四种用法1，since + 过去一个时间点（如具体的年、月、日期、钟点、ago. 1990 , last month , half past sixI have been here since 1990. 1990起，我一直在这儿。
2，since+ 一段时间+agoI h a v e b e e n h e r e s i n c e f i v e m o n t h s a g o。
自从五个月前，我已经在这儿了。
3，since+从句GreatChanges have taken place since you left. 自从你走后，已经发生了很大的变化。
4，It is +一段时间+since从句I t i s t w o y e a r s s i n c e I b e c a m e a n E n g l i s h t e a c h e r.我成为英语老师有两年了。
二，Since 和for区别1，Since +时间点，具体时间“自I have been in Beijing since 2010.从、以来，从、、、以后”用来说明动作起始时间2，For + 时间段，用来说明动作延续时间长度，因此句中的谓语动词，也应该是延续性动词。
I have been in Beijing for one year。
We have learnt English for about three years.I have been here for 3 days. (对)I have arrived here for 3 days.（误）三，延续性动词和终止性动词的概念英语中，动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词和终止性动词。
延续性动词表示能够延续的动作，这种动作可以延续下去或产生持久影响。
如：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等。
现在完成时中的since与for
现在完成时中的since与forSince 用来说明动作起始时间，for用来说明动作延续时间长度。
I have lived here for more than twenty years.I have lived here since I was born..My aunt has worked in a clinic since 1949.Some new oilfields have been opened up since 1976.I have known Xiao Li since she was a little girl.My brother has been in the Youth League for two years.I have not heard from my uncle for a long time.注意：并非有for 作为时间状语的句子都用现在完成时。
I worked here for more than twenty years.(我现在已不在这里工作。
)I have worked here for many years.(现在我仍在这里工作。
)小窍门：当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。
1)(对) Tom has studied Russian for three years.= Tom began to study Russian three years ago, and is still studying it now.2)(错) Harry has got married for six years.= Harry began to get married six years ago, and is still getting married now.显然，第二句不对，它应改为 Harry got married six years ago.或 Harry has been married for six years.。
现在完成时Since和for的用法
现在完成时Since和for的用法Since 和for 的用法 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。
Since+过去点的时间，for+一段时间(数词+量词)，此划线部分用how long提问。
一、since短语或从句表示过去的动作延续至今，since之后的时间为一点。
如： Mr. Smith has worked here since 1984. 1984年以来，史密斯先生一直在这工作。
He’s learned about 5,000 English words since he went to college. 他上大学以来大约学了五千个英语单词。
二、for短语表示动作延续多长时间，for的宾语为时间段。
如： We have known each other for twenty years. 我们认识有二十年了。
I haven’t seen her for a long time. 我好久没有见到她了。
练习：用since和for填空 1) ______ two years 2) _______ two years ago 3) _______ last month 4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock 7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children 10) _____ lunch time 11) ______ she left here 1. He has lived in Nanjing ________ the year before last. 2. I’ve known him __________ we were children. 3. Our teacher has studied Japanese _________ three years. 4. She has been away from the city ___________ about ten years. 5. It’s about ten years __________ she left the city. 2.短暂性转换延续性 ①arrive at/in sw. get to/reach sw. come/go/move to sw. →be in sw./at school/at home/on the farm/be here/be there 1) He got to Beijing five minutes ago. He ________ _________ _________ Beijing for _________ _________. 2) I moved to the USA last year. I ________ ________ __________ the USA since __________ __________. 3) I went home yesterday. I _______ ________ _________ home for _________ __________. 4) They came here last week. They _________ _________ here since _________ __________. ②come/go back, return →be back come/go out →be out 1) He came out two years ago. He _________ __________ _________ for __________ __________. 2) We return to Fuzhou yesterday. We ________ ________ _________ to Fuzhou since __________. ③become →be 1) I became a teacher in 2000. I ________ __________ a teacher for _________ _________. 2) The river became dirty last year. The river _________ _________ dirty for _________ __________. ④close →be closed open →be open 1) The shop closed two hours ago. The shop ________ _________ _________ for _________ _________. 2) The door opened at six in the morning. The door ________ ________ ________ for six hours. ⑤get up →be up die →be dead leave sw. →be away from sw. fall asleep/get tot sleep →be asleep finish/end →be over marry →be married 1) I got up two hours ago. I ________ ________ ________ since ________ ________. 2) He left Fuzhou just now. He _______ ________ ________ _________ Fuzhou for five minutes. 3) My grandpa died in 2002. My grandpa _______ _______ ________for _______ ________. 4) The meeting finished at six. The meeting ________ ______ ______ for six hours. 5) I got to sleep two hours ago. I ________ _________ _________ since _________ __________. 6) They married in 1990. They ________ _________ __________since _________. ⑥start/begin to do sth. →do sth. begin →be on 1) I began to teach at this school in 1995. I ____ ____ at this school since ____. 2) The film began two minutes ago. The film ____ ____ ____ for ____ ____. ⑦borrow →keep lose →not have buy →have put on →wear catch/get a cold →have a cold get to know →know 1) They borrowed it last week. They _________ _________ it since __________ __________. 2) I bought a pen two hours ago. I _________ _________ a pen for ________ __________. 3) I got to know him last year. I _________ __________ him since __________ __________. 4) I put on my glasses three years ago. I __________ __________ my glasses for _________ _________. ⑧have/has gone to →have been in 1) He has gone to Beijing. He ____ ____ _____ Beijing for two days. ⑨join the league/the Party/the army →be a league/a Party member/a soldier →be a member of the league/the Party →be in the league/the Party/the army 1) He joined the league in 2002. He ________ _________ a _________ _________ for two years. He ________ __________ a __________ ___________ the __________ for two years. He ____________ ___________ ___________ the league for two years. 2) My brother joined the army two years ago. My brother __________ __________ a ___________ for ___________ ___________. My brother ___________ ___________ in ____________ ___________ for two years. 3.汉译英 1)这本字典我已买了三年了。
for和since现在完成时的用法
“for”和“since”在现在完成时中的用法如下：
“for”用于表示一个时间段，即动作持续的时间长度。
它通常与表示时间的名词（如年、月、日、小时等）连用，表示某个动作或状态持续了多长时间。
例如：“I have lived here for five years.”（我已经在这里住了五年了。
）
“since”用于表示一个时间点，即动作开始的时间。
它通常与表示过去某个时间点的词语（如从句、过去分词等）连用，表示某个动作或状态从何时开始一直持续到现在。
例如：“I have not seen him since last year.”（自从去年以来我就没有见过他。
）
需要注意的是，“for”和“since”在现在完成时中的用法是有所区别的，需要根据具体语境进行区分。
同时，在使用现在完成时时，还需要注意动词的正确形式，以及与时间状语的搭配等问题。
for和since现在完成时例句
for和since现在完成时例句1. I have been studying for this exam for two weeks.2. She has been working as a nurse since she graduated from college.3. We have been waiting for the bus for over an hour.4. They have been living in this city since 2010.5. He has been waiting for the results since yesterday.6. The children have been playing outside for hours.7. I have been taking Spanish lessons for six months.8. She has been working at that company since she was 20.9. We have been saving up for our vacation for a long time.10. They have been dating since they met in college.11. The food has been cooking for over an hour.12. He has been driving for hours without a break.13. She has been feeling unwell since last week.14. They have been arguing for the past hour.15. I have been working on this project for months.16. We have been waiting for the concert to start for a while.17. The store has been closed for renovations since last month.18. He has been looking for his keys since this morning.19. She has been practicing the piano for years.20. They have been attending the same school since childhood.21. I have been saving up for a new car for a long time.22. She has been feeling tired for days.23. We have been living in this neighborhood since we got married.24. They have been planning the party for weeks.25. I have been studying English for a year.26. He has been searching for his lost dog since yesterday.27. She has been working on this project since last summer.28. They have been cooking dinner for the past hour.29. I have been waiting for my friend for over an hour.30. We have been shopping for new clothes for the trip.31. The sun has been shining for the past few days.32. She has been feeling unwell since last month.33. They have been talking for hours.34. I have been studying for my exams for weeks.35. He has been playing the guitar since he was a child.36. She has been working at the company for over a decade.37. They have been practicing for the upcoming performance.38. We have been waiting for the train for a long time.39. The rain has been falling for days.40. He has been traveling around the world since last year.41. She has been feeling better since she started her new medication.42. They have been dating for a few months.43. I have been working on this report for days.44. We have been saving up for a new house for years.45. He has been studying for his exams for weeks.46. She has been waiting for the bus since this morning.47. They have been living in the same house for years.48. I have been working at this company since I graduated.49. We have been thinking about our future for a while.50. The dog has been barking for hours.51. She has been feeling sick since last week.52. They have been playing basketball for the past hour.53. I have been writing in my journal for years.。
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①年代②时刻数③一段时间+agob).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) It’s +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 years 2) _______ two years ago 3) _______ last month4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children 10) _____ lunch time 11) ______ she left here12). He has lived in Nanjing ________ the year before last.13). I’ve 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). It’s 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。
现在完成时for 和since用法
现在完成时二用法：过去完成时表示过去发生的动作或存在的状态一直持续到现在（包括现在在内），常与for和since引导的时间状语连用，动词需要用延续性动词。
如：Mr.Green has been in China for 10 years .(格林先生来中国10年了)The film has been on for 20 minutes.(电影开始已经20分钟了)Since 与for的区别：for后面跟一段时间如：for three days for 2 years 等+ 过去的时间点：since 2004Since+ 一段时间ago ：since two minutes ago+ 过去时的句子：since I came to this school用since 和for 填空：1.I have kept the book _______ a week , I must return it on time .2.We have learned English _______ 5 years ago, so we have learned it ______ 5 years.3.Miss Li has taught maths ________ she came to this school ..4.I have had a cold _______ yesterday.5.The workers have worked _______ 10 hours . They are very tired.6.Great changes have taken place in China ______ it was founded.7.Our teacher has studied Japanese ______ three years.8. She has been away from the city ______ about ten years.9.. It’s about ten years __________ she left the city.短暂性动词的完成时态不能和表示一段的时间状语连用，当它需要与表示一段时间的时间状语连用时，通常需进行转化，见书119页。
【初中英语】初中英语语法since和for用法讲解
【初中英语】初中英语语法since和for用法讲解
【—语法since和for用法讲解r】大家在学习英语时，有很多的词表示同一个意思但是用法有很大的区别哦，今天老师就来为大家讲解一下since和for的用法，希望对大家有所帮助。
比较自始至终
since用来说明动作起始时间，for用来说明动作延续时间长度。
例如：我已经活了二十多年了。
我在这里住了二十多年了。
ihavelivedheresinceiwasborn.我从出生起就住在这儿了。
注：并非所有以for作为时间状语的句子都使用现在完成时。
iworkedhereformorethantwentyyears.(我现在已不在这里工作。
)
我在这里工作了好几年。
我现在还在这里工作
注意：用句型转换的方法，很容易排除非延续动词在有for/since结构的完成时中的误用。
1）汤姆学习俄语已经三年了，三年前开始学习俄语，现在仍在学习。
2)(错)harryhasgotmarriedforsixyears.=harrybegantogetmarriedsixyearsago,andisst illgettingmarriednow.
显然，第二句是错的。
它应该改为Harry GOTM arriedsix YearsGo或Harry Hasbeen HarriedSix Years
同学们，看看since和for的用法比较，大家有没有清楚一点呀，多多看看哦。
【初中英语】初中英语since与for的语法大全
【初中英语】初中英语since与for的语法大全【—since与for的】since与for是英语中经常需要同学们辨别的一词，下面就是老师为同学们带来的相关介绍。
因为用于指示操作的开始时间，而for用于指示操作的持续时间。
ihavelivedhereformorethantwentyyears.我从出生起就一直活着。
myaunthasworkedinaclinicsince1949.自1976年以来，一些新油田一直没有得到开发。
ihaveknownxiaolisinceshewasalittlegirl.我哥哥在你身边已经两年了。
ihavenotheardfrommyuncleforalongtime.注：并非所有以for作为时间状语的句子都使用现在完成时。
iworkedhereformorethantwentyyears.我现在不在这里工作ihaveworkedhereformanyyears.我现在还在这里工作小窍门：当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。
1）汤姆学俄语已经三年了=tombegantostudyrussianthreeyearsago,andisstillstudyingitnow.2）（错）哈利已经结婚六年了=harrybegantogetmarriedsixyearsago,andisstillgettingmarriednow.显然，第二句是错的。
它应该改为Harry GOTM arriedsix YearsGo或Harry Hasbeen HarriedSix Years对于since与for的比较，同学们看完之后是否已经知道了他们的区别呢？。
since,for 和 ago 的用法区别习题(答案及解析)
Since 和 for 都可用于完成时，而 ago 只能用于过去时，其中 since 后面连接的是一个时间点，可以是一个具体的年月日或事件，而 for 后面连接的是一个时间段，不一定是确定的时间，但必须是一段时间。
从词性和连接时间来看，since 可以是介词、连词或副词，而 for 只是介词，ago 是副词，因此答题的关键是从时态和词性出发。
一、用 since，for 或 ago 完成下列的句子1、Claire is in Poland now. She has been there _____ two weeks.2、Claire has been in Poland _____ May and she is still there.3、Claire went to Poland two weeks _____.4、Matthew is studying in his room. He has been studying _____ 8 am.5、Matthew has been studying in his room _____ five hours.6、Matthew went to his room to study five hours _____.7、I know Charlie. We got acquainted fifteen years _____.8、I have known Charlie _____ fifteen years and he is my best friend.9、Charlie is my best friend. We have known each other _____ we were ten.10、I read this book a week _____.11、This book is fascinating. I have been reading it _____ a week now.12、This book is fascinating. I have been reading it _____ last week.13、I haven’t spoken to Kate _____ 2020.14、I spoke to Kate two years _____.15、I haven’t spoken to Kate _____ ages and I miss her.二、答案及解析1、for解析：与现在完成时连用时，for 接的是一个时间段，since 接的是一个时间点或事件，所以选for。
Since 和 for 的用法及区别
Since 和for 的用法及区别：一，since 的四种用法1，since + 过去一个时间点（如具体的年、月、日期、钟点、ago. 1990 , last month , half past six I have been here since 1990. 1990起，我一直在这儿。
2，since+ 一段时间+agoI h a v e b e e n h e r e s i n c e f i v e m o n t h s a g o。
自从五个月前，我已经在这儿了。
3，since+从句GreatChanges have taken place since you left. 自从你走后，已经发生了很大的变化。
4，It is +一段时间+since从句I t i s t w o y e a r s s i n c e I b e c a m e a n E n g l i s h t e a c h e r.我成为英语老师有两年了。
二，Since 和for区别1，Since +时间点，具体时间“自从I have been in Beijing since 2010.、以来，从、、、以后”用来说明动作起始时间2，For + 时间段，用来说明动作延续时间长度，因此句中的谓语动词，也应该是延续性动词。
I have been in Beijing for one year。
We have learnt English for about three years.I have been here for 3 days. (对)I have arrived here for 3 days.（误）三，延续性动词和终止性动词的概念英语中，动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词和终止性动词。
延续性动词表示能够延续的动作，这种动作可以延续下去或产生持久影响。
如：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep,live, stay等。
现在完成时的持续型用法
现在完成时的持续型用法现在完成时还可表示过去某一时间开始并一直持续到现在(包括“现在”在内)的动作或状态，该用法中的动词多是延续性动词，常见的时态标志词有since和 for。
1. since意为“自从……以来”，它既可作介词，也可作连词。
作介词时，后接表示过去的时间点，表示某事开始的时间；作连词时，引导时间状语从句，从句常用一般过去时。
如：Mr. Miller has lived here since five years ago.（since+时间段+ago）I have had the dictionary since I was ten.(since+“一般过去时”)2. for作介词，后接一段时间，表示一个动作或一种状态已经持续了多长时间。
如：Miss Green has taught in the village for three years.Kate has been here for two hours.注意：1. 对since和 for引导的时间状语提问时，常用how long。
如：I have worked here for two years. (对划线部分提问)How long have you worked here?2. 在现在完成时中，含有for和since的句子可以相互转换。
如：Mary has been in Beijing for two days.（for+时间段）=Mary has been in Beijing since two days ago.（since+时间段+ago）3. 在现在完成时中，表示短暂意义的动词(如come和see)在肯定句和一般疑问句中不能和表示一段时间的时间状语连用，但在否定句中是可以的。
如：Bill has come here for an hour. (×)I haven’t seen Kate for three years. (√)4. It has been / It’s +时间段+since从句(一般过去时). 表示:“自从……以来，有多长时间了。
Since-和-for-的用法及区别
Since-和-for-的用法及区别Since和for的用法及区别：一 ,since的四种用法1,since +过去一个时间点（如具体的年、月、日期、钟点、ago. 1990 , last month , half past sixI have been here since 1990. 1990起，我一直在这儿。
2，since+ 一段时间+agoI have been here since five months ago。
自从五个月前，我已经在这儿了。
3，since+从句GreatChanges have taken place since you left. 自从你走后，已经发生了很大的变化。
4，It is +一段时间+since从句It is two years since I became an English teacher.我成为英语老师有两年了。
2,For +时间段，用来说明动作延续时间长度，因此句中的谓语动词，也应该是延续性动词。
I have been in Beijing for one year。
We have learnt English for about three years.I have been here for 3 days.（对）I have arrived here for 3 days.（误）,延续性动词和终止性动词的概念英语中，动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词和终止性动词。
延续性动词表示能够延续的动作，这种动作可以延续下去或产生持久影响。
如：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay 等。
终止性动词也称非延续性动词、瞬间动词或短暂性动词, 表示不能延续的动作，这种动作发生后立即结束。
如open, close, finish, begin, come, go, arrive, reach, get to, leave, move, borrow,buy 等。
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现在完成时Since和for的用法
Since 和for 的用法
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。
Since+过去点的时间，for+一段时间(数词+量词)，此划线部分用how long提问。
一、since短语或从句表示过去的动作延续至今，since之后的时间为一点。
如：
Mr. Smith has worked here since 1984. 1984年以来，史密斯先生一直在这工作。
He’s learned about 5,000 English words since he went to college. 他上大学以来大约学了五千个英语单词。
二、for短语表示动作延续多长时间，for的宾语为时间段。
如：
We have known each other for twenty years. 我们认识有二十年了。
I haven’t seen her for a long time. 我好久没有见到她了。
练习：用since和for填空
1) ______ two years 2) _______ two years ago 3) _______ last month
4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock
7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children
10) _____ lunch time 11) ______ she left here
1. He has lived in Nanjing ________ the year before last.
2. I’ve known him __________ we were children.
3. Our teacher has studied Japanese _________ three years.
4. She has been away from the city ___________ about ten years.
5. It’s about ten years __________she left the city.
2.短暂性转换延续性
①arrive at/in sw. get to/reach sw. come/go/move to sw.
→ be in sw./at school/at home/on the farm/be here/be there
1) He got to Beijing five minutes ago.
He ________ _________ _________ Beijing for _________ _________.
2) I moved to the USA last year.
I ________ ________ __________ the USA since __________ __________.
3) I went home yesterday.
I _______ ________ _________ home for _________ __________.
4) They came here last week.
They _________ _________ here since _________ __________.
②come/go back, return → be back come/go out → be out
1) He came out two years ago.
He _________ __________ _________ for __________ __________.
2) We return to Fuzhou yesterday.
We ________ ________ _________ to Fuzhou since __________.
③become → be
1) I became a teacher in 2000.
I ________ __________ a teacher for _________ _________.
2) The river became dirty last year.
The river _________ _________ dirty for _________ __________.
④close → be closed open → be open
1) The shop closed two hours ago.。