1、Before 用法小结与考点解读Before 用作连词时，意思是“在之前”。其实，它引导状语从句时，在不同的句式中以及汉英表达习惯的不同，before 含有不同的含义和用法。从历年的高考试题可以看出，before 是高考考查的热点词汇之一。为了帮助大家掌握，现就对它的用法归纳如下：一、表示“在之后才”。副词“才” 在汉语中强调某事发生得晚或慢。如果在含有 before 从句的复合句中，强调从句动作发生得晚或慢时，就可以应用这种译法。The American Civil War lasted four years _ the North won in the end.(2005 广东)A. af
2、ter B. before C. when D. then解析：答案为 B。本题考查连词 before 表示“在之后才”之的用法，根据本句含义“美国南北战争持续了四年，北方才最终取得胜利”，可知本题应选 B。二、表示“还没来得及就”。目的在于强调从句动作发生之前，主句动作已发生。Why didnt you tell him about the meeting? (2006 四川卷) He rushed out of the room _ I could say a word.A. before B. until C. when D. after解析：答案为 A。本题考查连词 before 表示
3、“还没来得及就”的用法。句意是“我还没来得及说一句话，他就冲出了房间”。三、表示“在之前就”。这时主句与 before 从句中的两个动作按时间先后依次发生。It was evening_ we reached the little town of Winchester. （2004 天津）A. that B. until C. since D. before解析：答案为 D。本题考查连词 before 表示“在之前就”的用法。句意是“我们到达小镇 Winchester 之前就已经是傍晚时分了”。四、表示“趁”，“等到”，或 “没等就 ”等。He made a mistake, but then
4、 he corrected the situation _ it got worse.（2003 北京）A. until B. when C. before D. as解析：答案为 C。由 made a mistake 和转折词 but 可知本题句意是“他出了差错, 但没等其进一步恶化，他就调整了局势”。故正确答案为 C 项。五、用于句型“It + will/would be + 时间段 + before.”句型中，表示“要过多久才”，也可用于“It + may be + 时间段 + before.”，表示“也许要过多久才”。其否定形式“It will/would not be +时间段+ b
5、efore”表示“不久就，过不了多久就”。（1）The field research will take John and Paul about five months; it will be a long time _ we meet them again.（2007 安徽卷）A. after B. before C. since D. when（2）How long do you think it will be _China sends a manned spacesship to the moon? （2006 福建卷）Perhaps two or three years.A. whe
6、n B. until C. that D. before（3）It _ long before we _ the result of the experiment.( 上海春招 2002)A. will not be.will know B. is.will know C. will not be.know D. is.know(4) Scientists say it may be five or six years_ it is possible to test this medicine on human patients. （2004 福建）A. since B. after C. b
7、efore D. when解析：答案为 BDCC。考题（ 1）(2)before 用于肯定的“It + will be + 时间段 + before.”句型中，表示“要过多久才”。考题（3）before 在本题中用于否定句,意为“过不了多久就会”,再由状语从句要用一般现在时态替一般将来时的用法可知 C 项为正确答案,句意是: 要不了多久我们就会知道试验的结果了。考题（4）宾语从句中含有句型“It + may be + 时间段 + before.”，表示“也许要过多久才”，故选择答案 C。六、用于句型 “it was +时间段 + before ” 表示 “过了（多长时间）才”。其否定形式 “
8、it was not +时间段+ before ” 意为“不久就”, “没过（多长时间）就”。It was some time _we realized the truth. （2005 山东）A. when B. until C. since D. before解析：答案为 D。before 用于句型“it was +时间段+ before ” 表示 “过了（多长时间）才” 。该题题意是 “过了一段时间我们才意识到事情的真相”。故正确答案为 C 项。七、和 hardly 连用，表示“刚一就”。该结构主句常用过去完成时，当 hardly 位于句首时，要用倒装语序，例如：I had hardly
9、 sat down before the telephone rang.Hardly had I sat down before the telephone rang.我刚一坐下电话就响了。八、和其它相似句型的区别有时候 before 引导的时间状语从句与 since，when 引导的时间状语从句在下列结构中较相似，容易混淆。“It be +时间段 + since 引导的时间状语从句”表示 “自从已经有多长时间了”。主句用一般现在时或现在完成时。“It be +时间点 +when 引导的时间状语从句 ”表示 “某个动作发生时，是某个时间”。主句谓语动词可以是一般过去时，也可以是一般将来时。（1
10、）It is almost five years we saw each other last time. （2005 北京春）A. before B. since C. after D. when（2） Did Jack come back early last night? （2005 福建） Yes. It was not yet eight o clock_ he arrived home. A. before B. when C. that D. until 解析：答案为 BB。考题（1）考查的是“It be +时间段 + since 引导的时间状语从句”结构，句意是“自从上次我们见
11、面以来已经近五年没有见了”，故选择答案 B。考题（2）考查的是句型“It be +时间点 +when 引导的时间状语从句”，句意是“他昨晚回家时还不到 8 点”，故选择答案 B。九、before long 和 long before 的区别before long 意为 “不久，很快”（其中 before 是介词，long 是名词），常在句中作状语，多与动词的过去时或将来时连用。例如：The work will be finished before long. 工作不久就会完成。Before long he had to move on again. 不久，他被迫再次迁移。long before
12、 意为 “很久以前”（其中 long 是副词。long before 单独使用时， before 是介词； long before 后接从句时，before 是连词。）这个词组常与过去时或过去完成时连用，跟从句时也可用在一般现在时的句子中。例如：She said that she had heard of it long before. 她说她早就听说过此事。It will be long before he arrives. 还要等很久他才能到达。巩固练习一、选词填空1. before long/long before(1) _he went to America.(2) I hope to
13、 see you _.(3) She said she had read the novel _.(4) I had not waited _ she came.（5）It was not _he got to know it.2. before/since/when(1) It was four 0clock _ they arrived at the town.(2) It has been 3 years_ his brother went abroad for further study.(3) It will be more than a week _ his mother reco
14、vers from the disease.二、翻译下列句子1. 不等我说一句话，她就冲出了房间。2. 他叔叔五年后才能回来。3. 不久之后，敌人就被赶走了。4. 他们不久就会互相了解的。5. 他们正在考虑趁房价未涨时把房子买下来。6. 我没等多久她就来了。7. 我们还需要很长时间才能完成这项任务。8. 不久他就学会使用计算机了。9. 过了一段时间之后他告诉了我这件事。10. 不久之后我们还会再见面的。11. 大火烧了近四个小时，消防战士才把它控制住。12.不久你就会对你的所作所为感到后悔的。13. 他刚一开口发言，就被其他人打断了。14. 不久他就知道了三、单句改错1. It was som
15、e time since they realized the importance os studies.2. It was at midnight when her husband came back home last night.3. It was about five hours when the workers shipped all the goods.4. We will finish the work long before. . 5. It will be half a year before his brother will graduate from that colle
16、ge. 6. I had known her before long. 四、单项选择1. Why didnt you tell him about the meeting ? He rushed out of the room _ I could say a word.A. before B. until C. when D. after2. How long do you think it will be _China sends a manned spaceship to the moon?Perhaps two or three years.A. when B. until C. tha
17、t D. before3 .He was told that it would be at least three more months he could recover and return to work. A. when B. before C. since D. that4. Several weeks had gone by_ I realized the painting was missing. A. as B. before C. since D. when5. Scientists say it may be five or six years_ it is possibl
18、e to test this medicine on human patients. A. since B. after C. before D. when6. The American Civil War lasted four years _ the North won in the end. A. after B. before C. when D. then7. That was really a splendid evening. Its years _ I enjoyed myself so much. A. when B. that C. before D. since 8. I
19、t was some time _we realized the truth. A. when B. until C. since D. before9 .He was told that it would be at least three more months he could recover and return to work. A. when B. before C. since D. that10. Wheres that report? I brought it to you _you were in Mr. Blacks office yesterday.A. if B. w
20、hen C. because D. beforeKeys:一、选词填空1. (1) Before long (2) before long (3) long before (4) long before (5) long before2. (1) when (2) since (3) before 二、翻译下列句子1. She had stormed out of the room before I could say a word2. It will be five years before his uncle comes back. 3. It was not long before th
21、e enemy was driven out of their country. 4. It wont be long before they understand each other. 5. They are thinking of buying the house before the prices go up. 6. I had not waited long before she came. 7. It will be a long time before we finish the task. 8. It wasnt long before he learned to use th
22、e computer.9. It was some time before he told me about this affair.10. It wont be long before we meet again.11. The fire lasted about four hours before the firefighters could control it12. It wont be long before you feel sorry for what you have done.13. He had hardly begun to speak before the others
23、 interrupted him.或 Had he begun to speak before the others interrupted him.14. It was not long before he got to know it.三、单句改错1. since 改为 before 或 was 改为 is2. when 改为 that 或去掉 at3. when 改为 before4. long before 改为 before long 5. will graduate 改为 graduates. 6. before long 改为 long before四、单项选择15 ABBBC
24、610 BDDBBbefore 的用法27 The most destructive natural disaster, tsunami, came unexpectedly_ they will always live in peace and comfort.A after B while C where D whenbefore 的用法 :(1) (时间 ) 在 之前, (位置) 在 的前面(2) 才, (强调 before 引导的从句动作发生的很晚很迟),例如:He nearly knocked me down before he saw me.(3) 还未来得及/不等 就(强调主句动
25、作发生在 before引导的从句动作之前), 例如:He went out before I had a chance to tell him the good news.(4) 不久 就,例如:It wont be long before you get well again.(5)宁愿 也不, 例如:He will die of hunger before he will steal.考例:(NMET 2000) Some one called me up in the middle of the night, but they hung up_ I could answer the ph
26、one. A as B since C until D before(03 北京) He made a mistake, but then he corrected the situation_ it got worse.A until B when C before D as(04 天津 ) It was evening_ we reached the litter town of Winchester.A that B until C since D before(04 福建) Scientists say it may be five or six years_ it is possib
27、le to test this medicine on human patients.A since B after C before D when(05 广东) The American Civil War lasted four years_ the North won in the end.A after B before C when D then(03 江苏调研)-Why didnt you help the little boy? -Oh, sorry. He had struggled to his feet_ I ran over.A until B after C befor
28、e D since(05 辽宁联考)He had to be called two or three times_ he would come to his dinner.A before B when C until D as(苏锡常镇一) She was such a proud person that she would die_ she would admit she was wrong.A rather than B until C after D beforeIt has been announced that it wont be long_ our country_ an unmanned spaceship to explore the moon.A before; sends up B until; sends upC since; sends up D before; will send up
