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ever since的用法

ever since的用法
ever since的用法

1.ever since 的结构:(作为连词)=since 完成时态---- ever since +主+动词简单过去式

例:I have known him ever since he was a child.

他从小我就认识他了。

这种用法同since 差不多,不过 ever since 比 since 用得少。

再如:We have lived in Shanghai ever since we came to China.(自从我们来到中国之后就住在上海。)

2.以上所说的 ever since 作为连词。

ever since 也可作为副词,解释“此后”(就一直...)

例:1)He fell ill at Christmas and has been ill ever since.

他在圣诞节生病了此后就一直不适。(has + be ill)

2)He left home last year and has been away ever since.

他去年离家走了,此后一直在外面。(has + be away)

3)He fell off his horse a week ago and has been in bed ever since.

一周前他从马背上跌下来,从那以后就一直躺在床上。

4)He went to Turkey in 1950 and has lived there ever since.

他在1950年去土耳其,此后就一直住在那里。

3. has not been able to 这实际上就是 be able to 加上 have 罢了。所

谓 be able to 就是“有可能”不是“能”(can)。如果一直,始终没有可能就是has not been able to ,这很简单。

如果 it has not been easy. 就是“那件事一直不是轻而易举的。”完成时态不一定都解释为“已经”,有时要解释为“一直”。

相关词汇:

have trouble with sb. 与某人发生了纠纷

return home 不可用 return to home

at night 不可用 at the night

because of 由于

even once 即使是一次

have effect 产生效果

turn ... to 把···变为

各种时态的用法

各种时态的用法 一、一般现在时 构成:a.主动:动词原形(主语是第三人称单数时,谓语动词要加s/es);be动词要用am,is,are。 b.被动:am / is / are + 过去分词 用法: ①一般现在时表示经常性或习惯性的动作,常用频度副词sometimes, often, always, usually, seldom及时间副词every day, night, week, month, year, in the morning, in the afternoon, in the evening, at night做状语。如: I go to school at 6 every morning. 每天早上我6点去上学。 ②一般现在时表示客观存在及普遍真理。如: Summer follows spring. 春天之后是夏天。 The sun rises in the east. 太阳从东方升起。 注意:此种用法即使出现在过去的语境中,仍用一般现在时。如: I learned that the earth goes around the sun when I was in primary school. 我在小学就学过地球是围绕太阳转的。 ③一般现在时表示格言或警句。如: Pride goes before a fall. 骄兵必败。 ④一般现在时表示目前的情况或状态,常跟时间副词now连用。如: I am a teacher. Peter writes good Chinese but does not speak well. He lives in Beijing now, ⑤以here,there等开始的倒装句,表示动作正在进行。如: Here comes the bus. = The bus is coming. There goes the bell. = The bell is ringing. ⑥习惯性的爱好或行为。如: I like dancing while she likes singing. 我喜欢跳舞,而她喜欢唱歌。 We get up at six. ⑦在某些习惯表达法中,常用一般现在时表示已经发生过的动作或存在的状态。如: They say Wu Dong is ill. 据说吴东病了。 The paper says the disease is under control. 报纸上说这种病已经得到了控制。 The diagram tells us that people’s living is improving. 这份图标告诉我们,人们的生活正在改善。 ⑧在下列情况下表示将来: a.在(时间、条件等)状语从句中用一般现在时代替一般将来时。如: I will give it to him as soon as I see him. 我一看见他就会交给他。 He will come if you invite him. 如果你请他,他会来的。 Suppose he doesn’t agree, what shall we do? 假如他不同意,那怎么办? I shall do as I please. 我高兴怎么做就怎么做。 He will continue the work no matter what happens. 不管发生什么情况他都要继续这项工作。 b.在the more…the more…(越…越…)句型中,前者通常用一般现在时代替一般将

since的用法

一.用作介词,意思是“从……以来,自从”,常与完成时连用。 I haven’t written home since Christmas. 自圣诞节以来,我未曾写信回家。 二.用作副词,意思是“从那时以后(一直到现在)”,“其后(到现在之间)”; ever since从那以后一直(更加强调since的用法)。 Things have not changed very much since. 从那时起,情况并没有太大的改变。 His first book was a great success and he has been famous as a writer ever since. 他的第一本书非常畅销,从那时起他就成了一位名作家。 He got a job with the firm in 1970 and has worked there ever since. 他从1970年开始在那家公司任职,之后就一直在那里工作。 三.用作连词 1. 引导原因状语从句,相当于now that,意思是“因为……,既然……,鉴于……”。 Since the rain has stopped,let’s go for a walk. 既然雨停了,我们出去散散步吧。 Since we are young,we shouldn’t be too afraid of making mistakes. 因为我们还年轻,所以不应该太害怕犯错误。 注意:since表示原因时,语气比because弱,表示的原因是对方已知的,或是句中不很重要的部分,是附带的原因,因此引导的从句不是信息的焦点,不能回答why的提问,也不能用在强调句型中作为被强调的内容。since引导的从句往往放在主句之前。 2. 引导时间状语从句,此用法较复杂。 (1) 若since引导的状语从句的谓语动词是终止性动词(如go,come,leave,start,begin等)的过去时,则从句表示的时间是“从该动作开始的那一时刻起”。这是最常见的一种用法。如: He has studied very hard since he came to our school. 自从来到我们学校,他学习就非常努力。 Great changes have taken place in our school since you left. 自从你离开这里,我们学校发生了很大的变化。 (2) 若since引导的状语从句的谓语动词是持续性动词或表示状态的静态动词(如live,stay,study,learn,smoke,be等)的过去时,则从句表示的时间是“从该动作或状态的完成或结束时算起”。如: I haven’t heard from him since he lived here. 这句话应译为:从他不住这儿起,我一直没有收到他的信。 I haven’t eaten snakes since I was a student at school. was表示状态,因此该句可理解为:I haven’t eaten snakes since I left school. 自从我毕业后就一直没吃过蛇。

SINCE的用法结构及修饰对象

说到since,我们最熟悉的用法或许就是“since前面要用现在完成时态”,其实,since还有其他不同的用法,这些用法容易被大家忽略。本期笔者就来系统梳理since的用法,定会让大家开阔眼界。 since用法的思路体系 下面笔者从两个角度来考察since的用法:一是since后面的结构特点;二是since前面的修饰对象特点(这是本期内容的重点)。笔者先给结论,然后再举例论述。请看下列表格。 从以上表格我们看到,一方面,从since后面所跟的结构特点来看,可以分为三种情况。 a. since后面接一个从句,此时since是连词(conjunction)。 b. since后面接一个名词短语,此时since是介词(preposition)。 c. since后面不接任何东西,而是单独使用,此时since是副词(adverb)。 另一方面,从since前面的修饰对象来看,也可以分为三种情况。 1. 修饰谓语动词:此时作时间状语(本文不讨论since作原因状语的情况),谓语动词的时态多用现在完成时态(have done),但根据语境和时间关系,谓语动词也可能用过去完成时态(had done)。 3. 修饰普通名词:此时作后置定语,普通名词是相对于“最高级名词”而言的。 现在,我们可以把上面两方面因素各三个变量进行排列组合,得出since各种用法的句子。下面一一举例来说明。 since修饰谓语动词 我们首先来看一个例句。 他有生以来遭遇过多次困境。 b. he has faced many difficult situations since last year. 自去年以来,他一直屡遭困境。 c. he began to get into trouble last year and has faced many difficult situations (ever) since. 他去年开始陷入困境,此后一直屡遭窘境。 解析:我们看到,b句中since后面接了名词短语last year,而c句中since后面没有接任何成分,此时也可以说ever since。 另外,值得注意的是,在特定的上下文语境中,since前面可以使用过去完成(进行)时态。请看下面一组例句。 2. a. mr. bin laden has been hiding since 2005. b. mr. bin laden had been hiding since 2005. 解析:a句用现在完成进行时态,这意味着本拉登到现在还没有死亡,仍在潜逃。而实际上,他已经于2011年被击毙,因此为了符合这一实际情形,b句用了过去完成时态来表达。 since修饰“最高级名词” 请比较下面例句。 他有生以来遭遇过多次困境。 他将会遇到有生以来最困难的境况。 他将会遇到从2000年以来最困难的境况。 另外,我们还可以采用“in +时间段”来替换“sin ce +时间点”,用于限定最高级的时间范围。比如,今年是2016年,于是例3的c句中的since 2000就相当于说in 16 years,我们可以把c句改成这样一句话。 他将会遇到16年以来最困难的境况。 英国正遭到60年以来的最严寒的冬天。 在正文中,作者继续详细讲述,又出现了两个“since+时间点”及“in +时间段”与最高级搭配的句子。

人教版英语八年级下册试题since 和 for 的用法(用于现在完成时)

初中英语学习材料 madeofjingetieji 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+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) 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 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 12). 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+ ago 3. 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 → wear14) 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.

初中英语八大时态结构及用法详解

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How often does the shuttle bus run? 2) 在时间和条件状语从句中常使用一般现在时表示将来发生的事情: When Bill comes (不用will come), ask him to wait for me. I shall go there tomorrow unless I’m too busy. 2一般过去时 标志:动词过去式 *闭音节:元音字母a, e, i, o, u如果发字母本来的音则称为开音节,否则称为闭音节。 1. 表示过去某时所发生的动作或存在的状态,常与表示过去的时间状语连用(e.g. yesterday, this morning, just now, a moment ago, in May, last night / year / week, once upon a time, the other day, before …, when …, in the past等)。如: Jim rang you just now. Liu Ying was in America last year. 2. 表示过去经常或反复发生的动作,特别是used to do表达的句型,本身表示 的就是过去常常。如: When I was a kid, I often played football in the street. She used to visit her mother once a week. *注意区分sb. used to do sth.(某人过去常常做某事,此处to是动词不定式 标志符号)和sb. be used to sth./doing sth.(某人习惯于某物/做某事,此处to 是介词)。 3. 代替一般现在时,表示一种婉转、客气、礼貌、商量的语气。此用法仅适用于少数动词(如want, hope, wonder, think, intend等)及情态动词could, would。如:

初中英语八大时态结构及用法

初中英语八大时态结构及用法 时态无疑是初中英语最重要的语法内容,学好时态基本就拿下了语法的半壁江山。 英语八大时态: 一、一般现在时 标志:动词原形 1. 表示经常性或习惯性动作,常与表频度的时间状语连用: She often speaks English. I leave home for school at 7 every morning. 2. 表示现在的状态、特征、职业、能力、感觉等: He seems to feel a bit down today. He works as a driver.

3. 表示真理、客观存在、科学事实或用于格言警句中: Shanghai lies in the east of China. Columbus proved that the earth is round. Where there is a will, there is a way. 4. 表示现在瞬间的动作: Here comes the bus! 5. 表示将来: 1)表按规定、计划、安排将要发生的动作(仅限于某些表示“来、去、动、停、开始、结束、继续”等的趋向动词),可以与表示未来的时间状语搭配使用。常见的用法是:飞机、火车、轮船、汽车等定期定点运行的交通状况。如: The next train leaves at 3 o’clock this afternoon. How often does the shuttle bus run? 2)在时间和条件状语从句中常使用一般现在时表示将来发生的事情:When Bill comes(不用will come)ask him to wait for me. I shall go there tomorrow unless I’m too busy. 二、一般过去时 标志:动词过去式

中考英语:since与for用法

现在完成时态中的since 与for 1. 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。如:(https://www.wendangku.net/doc/9617933746.html,) I haven’t seen him for a long time. 我很久没见到他了。 He hasn’t come here for some time. 他有段时间没来了。 I haven’t heard from her since she left. 自他离开以后,我一直没收到她的来信。

人教版英语英语动词的时态用法总结及解析百度文库

人教版英语英语动词的时态用法总结及解析百度文库 一、初中英语动词的时态 1.--- Will you go to America next month? ---Yes. But I promise I will call you as soon as I _________there. A.get to B.will get to C.will get D.get 【答案】D 【解析】 【详解】 句意:——下个月你将要去美国吗?——是的。但是我保证我一到达那里,就给你打电话。as soon as引导的时间状语从句,用一般现在时,主句用一般将来时。there是副词,前面不加介词,get there到达那里。故选D。 2.— Who the classroom tomorrow, Tony? — Our group. A.will clean B.cleans C.cleaned D.clear 【答案】A 【解析】 句意:——托尼,明天谁打扫教室?——我们小组。考查一般将来时。根据提示词tomorrow可知时态用一般将来时,其构成为:will+动词原形;故答案选A。 3.Jenny_______in the kitchen when you called her at 5 o'clock this afternoon. A.is cooking B.was cooking C.cooks D.cooked 【答案】B 【解析】 本题难度适中,考查过去进行时,当你昨天5点打电话给她时,他正在煮饭,答案是was cooking,选B。 4.—Do you know _________ the meeting? —Tomorrow morning. A.when they had B.when they are going to have C.when did they have D.when are they going to have 【答案】B 【解析】 【详解】 句意:——你知道他们什么时候来开会吗?——明天早上。 此题考查宾语从句,宾语从句要用陈述句语序,C和D是疑问句语序,故排除;根据回答Tomorrow morning可知此句时态是一般将来时,A是一般过去时,B是一般将来时;故选

since用法小结

Since 用法小结 一.Since作为介词,后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。例如: 1、He left the village in 1982 and I haven’t seen him since then.1982年他离开这个村子,从那以后我再没见过他。 2、She’s been working in a bank since leaving school.她中学毕业后就一直在一家银行工作。 3.He had spoken to her only once since the party. 自从那次聚会以来,他只跟她说过一次话。 二.Since作为副词,表示从过去以来、以后或到现在的情形或状态,常与现在完成时态连用。例如: 1.He left home two weeks ago and we haven’t heard from him since. 他两周前离开了家,到现在我们一直没有他的消息。 2.He came to Zhenjiang 6 years ago and has lived here (ever) since.他6年前来到镇江,从此便住在这里。 三.since引导原因状语从句

作为连词,since可引导原因状语从句,表示因为;既然;鉴于:例如: 1.He didn’t come since he was busy.他因为忙,所以没有来。 2.Since this method doesn’t work, let’s try another.既然这种方法不行,我们就试用另一种吧。 四.Since引导时间状语从句 1.若since引导的状语从句的谓语是终止性动词的过去时,则从句表示的时间是“从动作开始的那一时刻起”。例如: He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力。 We have been missing them since they left here自从他们离开这里,我们就一直很想念他们。 2.若since引导的状语从句的谓语动词是持续性动词或表示状态动词的过去时时,则从句表示的时间是“从动作或状态结束时算起”。例如: I haven’t heard any noise since I slept. Sleep 为持续性动词,sleep的动作结束时,即“醒来”时,所以这句应译为“我醒后还未听到任何声音”。

种英语时态的用法

本专题为大家讲解了16种英语时态的用法,为大家总结了英语时态表,方便同学们更好的英语时态的结构. 英语的基本时态由三种“时”(时间),四种“态”(状态)交叉构成。 三种“时”:过去现在将来 四种“态”:常态进行态完成态完成进行态 一般时进行 时完成时完成进行时 现在 study be studying have studied have been studying 过去 studied be studying had studied had been studying 将来 will study wil be studying will have studied will have been studying 过去将来would study would be studying would have studied would have been studying

时态(Tense)是表示行为、动作和状态在各种时间条件下的动词形式。因此,当我们说时态结构的时候,指的是相应时态下的动词形式。 Ⅰ现在时态:四种 1.一般现在时态:表示现存的状态(be动词),经常做的动作 I do it. 我(经常)做这件事。 2.现在进行时态:表示正在进行的动作 I am doing it. 我(现在)正在做这件事。 3.现在完成时态:表示现在已经完成,对现在产生影响,形成结果 I have done it. 我(现在)已经做完这件事了。 4.现在完成进行时态:表示一直在进行的动作(字面意思已经在进行) I have been doing it. 我(现在)一直正在做这件事。 Ⅱ过去时态:四种 5.一般过去时态:表示过去存在的状态(be动词),经常做的动作 I did it. 我(过去经常)做这件事。 6.过去进行时态:表示过去正在进行的动作 I was doing it. 我(过去的某个时间)正在做这件事。 7.过去完成时态:表示过去已经完成,对过去的某个时间产生影响,形成结果 I had done it. 我(过去的某个时间)已经做完这件事了。 8.过去完成进行时态:表示一直在进行的动作(字面意思已经在进行) I had been doing it. 我(到过去的某个时间)一直在做这件事。 Ⅲ 将来时态:四种 9.一般将来时态:表示将来存在的状态(be动词),将来经常做的动作

英语中的各种时态及用法

英语中的各种时态及用法 英语的时态(tense)是一种动词形式,不同的时态用以表示不同的时间与方式。是表示行为、动作和状态在各种时间条件下的动词形式。因此,当我们说时态结构的时候,指的是相应时态下的动词形式。英语时态分为16种:一般现在、一般过去、一般将来、过去将来时,以及这四者的进行时、完成时和完成进行时下面就英语中常见的八种基本时态进行阐述,其它的时态都是在这八种时态的基础上结合而成的。 一、一般现在时: 1.概念:经常、反复发生的动作或行为及现在的某种状况。 2.时间状语: always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays, 3.基本结构:动词原形(如主语为第三人称单数,动词上要改为第三人称单数形式) 4.否定形式:am/is/are+not;此时态的谓语动词若为行为动词,则在其前加don't,如主语为第三人称单数,则用doesn't,同时还原行为动词。 5.一般疑问句:把be动词放于句首;用助动词do提问,如主语为第三人称单数,则用does,同时,还原行为动词。 6.例句:. It seldom snows here. He is always ready to help others. Action speaks louder than words. 二、一般过去时: 1.概念:过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为。2.时间状语:ago, yesterday, the day before yesterday, last week,last(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc. 3.基本结构:be动词;行为动词的过去式4.否定形式:was/were+not;在行为动词前加didn't,同时还原行为动词。5.一般疑问句:was或were放于句首;用助动词do的过去式did 提问,同时还原行为动词。 6.例句:She often came to help us in those days. I didn't know you were so busy. 三、现在进行时: 1.概念:表示现阶段或说话时正在进行的动作及行为。2.时间状语:now, at this time, these days, etc. 3.基本结构:am/is/are+doing 4.否定形式:am/is/are+not+doing. 5.一般疑问句:把be动词放于句首。6.例句: How are you feeling today? He is doing well in his lessons. 四、过去进行时: 1.概念:表示过去某段时间或某一时刻正在发生或进行的行为或动作。2.时间状语:at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。3.基本结构:was/were+doing 4.否定形式:was/were + not + doing. 5.一般疑问句:把was或were放于句首。6.例句:At

since的用法

It is +一段时间+since…的句型与It has been +一段时间+since…意思相同,since从句用现在完成时。前者是规范说法,后者是口语说法。 It was+一段时间since从句就用过去完成时。 一、若since引导的状语从句的谓语动词是终止性的过去时 He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力。 We have been missing them since they left here自从他们离开这里,我们就一直很想念他们。It has rained a great deal since you left.你走之后下了好多雨。 We have resided in Shanghai since we parted.自从分手以后,我们一直住在上海。 这是最常见的一种用法,此处不再多述。 二、若since引导的状语从句的谓语动词是延续性动词或表示状态的动词的过去式时 I haven’t heard any noise since I slept.这句应译为“我醒后还未听到任何声音”。 John is now with his parents in New Y ork, it is already three years since he was a teacher约翰现在和父母一起住在纽约,他不当教师已经三年了。 It's two years since I smoked我戒烟已经两年了。 How long is it since you lived in Shanghai?你离开(没住在)上海多久了? It is half a month since he was a League member.他退团(不当团员)半个月了。 It’s been quite some time since I was last in London我离开伦敦已很长时间了。 It has been so long since we were all together. 好久我们没有在一起团聚了。 It is a week since he was in hospital.他出院已有一星期了。 比较: He has written to me frequently since I was ill.自从我病愈以来,他屡次给我写信。(从句谓语为状态动词) He has written to me frequently since I fell ill.自从我生病以来,他就屡次给我写信。(从句谓语为终止性动词) 三、若since引导的状语从句的谓语为持续性动词的现在完成时 I haven’t heard from him since he has lived there。这里has lived表示动作的持续性,时间的起点应从:“开始居住”时算起。因此此句可理解为“自从他(开始)住在那儿起,我就一直没收到他的来信”。 Since we have owned a car, we have gone camping every year。自从我们自己有了汽车,我们每年都去野营。 试比较: Since I’ve been at this school, we have had three headmasters.自从我到这所学校,我们已换了三个校长了。 Since I was at this school, they have had three headmasters.自从我离开这所学校,他们已换了三个校长了。 He has never been to see me since I have been ill. 自从我生病以来,他从未来看过我。 He has never been to see me since I was ill. 自从我病愈以来,他从未来看过我。 四.since与ever连用时,延续性动词的一般过去时充当从句的谓语

Since-和-for-的用法及区别

S i n c e-和-f o r-的用 法及区别 -CAL-FENGHAI-(2020YEAR-YICAI)_JINGBIAN

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+ago I 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Great Changes 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、、、、以来,从、、、以后”用来说明动作起始时间 I have been in Beijing since 2010. 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:

时态定义和用法

小学英语时态复习: 一、一般现在时: 1、概念:经常、反复发生的动作或行为及现在的某种状况。 时间状语:often,usually,always,sometimes,every week(day,year,month),once a week,on Sundays,never, ever… 2、基本结构: ①be动词is am are+名字、年龄、形容词等; ②行为动词原形或第三人称单数 3、否定形式:① am /is /are +not+名字、年龄、形容词等; ②谓语动词若为行为动词,则在其前加don't,如主语为第三人称单数,则用doesn't,动词用原形。 4、一般疑问句: ①把be动词放于句首; ②用助动词 do提问,如主语为第三人称单数,则用does,动词用原形。 二、一般过去时: 1、概念:过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为。时间状语:ago,yesterday,the day before yesterday,last week (year,night,month...),in 1989,just now, one day,long long ago,before 2、基本结构:①be动词用was或were; ②行为动词+ed 3、否定形式:① was/were +not; ②在行为动词前加didn't,同时动词用原形。 4、一般疑问句:①was/were放在句首; ②用助动词did提问,动词用原形。三、现在进行时: 1、概念:表示现阶段或说话时正在进行的动作及行为。 时间状语:now,at this time,these days,(有look! listen! Be动词或动词ing) 2、基本结构:am/is/are +动词ing 3、否定形式:am/is/are +not+动词ing 4、一般疑问句:把be动词放在句首 四、过去进行时: 1、概念:表示过去某段时间或某一时刻正在发生或进行的行为或动作。 时间状语:at this time yesterday,at that time,at3:00yesterday… 2、基本结构:was/were +动词ing 3、否定形式:was/were +not+动词ing 4、一般疑问句:把was或were放在句首 五、一般将来时: 1、概念:表示将要发生的动作或存在的状态及打算、计划或准备做某事。 时间状语:tomorrow,the day after tomorrow,next day(week,month,year,Monday....),soon,in a minute, later 2、基本结构:①am/is/are/going to +动词原形; ②will/shall+动词原形 3、否定形式:①am/is/are +not +going to +动词原形; ② will/shall+not+动词原形 4、一般疑问句:①be放于句首; ② will/shall提到句首

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