《after,before,since用法区别》由会员分享，可在线阅读，更多相关《after,before,since用法区别（10页珍藏版）》请在金锄头文库上搜索。
1、 after，before，since用法区别1.after的用法小结1. 用作介词，与一段时间连用表示“在之后”时，注意它与 in的区别：after表示以过去时间为起点的一段时间以后，且通常与过去时态连用；而in则表示以现在为起点的一段时间以后：He came backafter two days. 他两天后就回来了。He will come back in twodays. 他过两天就回来。但 after 若是与一点时间连用，则可与过去时态也可与将来时态连用：He came back after 4 oclock. 他是四点钟以后回来的。He will come back after ne
2、xt month. 他将在下个月以后回来。2. 用作连词引导时间状语从句时注意：若主句用将来时态 (或含有将来意味)，则时间状语从句要用一般现在时态 (表将来意义)，而不能直接使用将来时态：他回来后我就走。正：Ill leave after he comes back.误：Ill leave after he will come back.3. 用作副词，表示“后来”、“ (一段时间)以后”，通常放在表示时间的副词之后：soon after 不久以后two days after 两天后4. 用于习语after all 终究，毕竟：I was right after all. 毕竟我是对的。Af
3、ter all, hes only six years old. 毕竟，他才六岁。2.Before的用法小结高三课本第十五单元，INTER GATING SKILLS 和 WORKBOOK READING部分有如下的句子：The shop was successful，but it was about sixty years before people started to buy jeans for fashion as well as for work.However，it probably will not be long before the other mountainous are
4、as of China such as Sichuan，Xinjiang and Yunnan are developed，and as more facilities become available，prices will almost certainly fall.其中涉及到before的用法，下面就其用法进行总结。一、可以用作介词)指时间上早于，在之前，如：She has lived here since before the war.她从战前就一直在这儿住。)指位置在前面，如：We knelt down before Grandmas grave.我们在奶奶的墓前跪下。)指顺序或排列
5、在之前，如：Your name comes before mine on the list.名单上你的名字在我之前。)在某人面前，如：She said it before the witness.他是当着证人的面说的。二、作为连词其基本含义是“在之前”，又可以根据不同语境灵活翻译成“才”、“还没来得及就”、“趁”、“就”等。具体用法如下：)与情态动词can/could连用这时候从句虽为肯定形式，根据汉语表达习惯译成“还没来得及就”，如：Before I could get in a word，he had measured me.我还没来得及插话他就为我量好了尺寸。Before she cou
6、ld move，she heard a loud noise，which grew to a terribl eroar.她还没来得及迈步，就听见一声巨响，接着就是可怕的隆隆轰鸣。)用于肯定句中强调主句所表达的时间，距离长，或花费的精力大，译成“才”We had sailed four days and four nights before we saw lands.我们航行了四天四夜才看到陆地。We waited a long time before the train arrived.我们等了很长时间火车才到。)用于否定句中，强调主句所表达的时间，距离短，或花费的精力小，译成“不到就”如：
7、We hadnt run a mile before he felt tired.我们跑了还不到一英里他就累了。)主句含有hardly，scarcely等半否定副词时可以译为“刚就”这时候主句应用过去完成时态，从句用过去时，还可以用when替代before如：We had scarcely reached the school before/when the bell rang.我们刚到学校铃声就响了。)有时还有“宁愿”的意思Id shoot myself before I apologized to him.我宁死也不向他道歉。)用于It+be/take+时间段+before句型在这一句型中
8、又可以根据主从句的时态分成两种情况。若主句是一般时将来时态，从句是一般现在时.若主句是肯定句意思是“要过多长时间才”；若主句是否定形式翻译成“用不了多久就”。It will be two weeks before everything returns to normal.两周之后一切才能恢复正常。It will be many years before the situation improves.这种状况或许要过许多年才能得以改善。It wont be long before we meet again.用不了多久我们就会再见面的。这时若主句是一般过去时从句也是一般过去时。若主句是肯定句翻译
9、成“多长时间之后才”，若主句是否定形式翻译成“没过多久就”。如：It was some time before I realized the truth.过了很长一段时间我才了解到真相。It wasnt long before she became a brave solider.没过多久她就成了一名勇敢的战士。After that it still took seven years before they got married.他们又过了七年才结婚。注意：当主句的谓语动词为延续性动词时，before与until有时可以互换。It was an hour before/until the p
10、olice arrived.巩固练习(2004天津)It was evening _ we reached the little town of Winchester.Athat B.until C.since D.before2.(2004全国)Several weeks had gone by _ realized the painting was missing.A.as B.before C.since D.when3.(2005广东)The America Civil War lasted four years _ the North won in the end.A.after B
11、.before C.when D.then4.(2005山东)It was some time _ we realized the truth.A.when B.until C.since D.before5.(2006四川)-Why didnt you tell him about the meeting？-He rushed out of the classroom _ I could say a word.A.before B.until C.when D.after6.(2006福建)-How long do you think it will be _ china sends a m
12、anned spaceship to the moon？-Perhaps two or three years.Awhen B.until C.that D.before参考答案：DBBDAD3.Since用法一时态、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 havent seen him since then.1982年他离开这个村子，从那以后我再没见过他。 2、Shes 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 spo
13、ken 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： 1He left home two weeks ago and we havent 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。 2He 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，sin
14、ce可引导原因状语从句，表示因为；既然；鉴于：例如： 1 He didnt come since he was busy.他因为忙，所以没有来。 2 Since this method doesnt work,lets try anoter.既然这种方法不行，我们就试用另一种吧。 四Since在特殊句型中的应用 句型I：“It is （has been）+时间+since+持续性动词的过去时”，表示“自从以来到现在已有多久。”例如： It has been quite some time since I was last in London.我上次离开伦敦至今颇有一段时间了。 句型II：“It was+时间+since+持续性动词的过去完成时”,表示“从到过去某时间点以来”，例如：It was three years since we had been here.那时我们在这已呆了三年。 六巩固练习 （一）单项选择1Do you smoke？_
