It …+点时间段时间+before…诠释.doc

It +点时间/段时间+before诠释高中英语中，before句式，相似性强，考生易混淆，究其用法，现小结于后，敬供商榷。1.It was / will be +段时间+ before 在“It was / will be +段时间+ before从句”结构中，before是从属连词，表示“才；就”，引导时间状语从句。例：It was just 3 daysbeforethe book was published.三天后那本书就出版了。例：It will be five yearsbeforewe meet again.五年后我们才会在见面。2. It wasnt long before / It wont long before 在“It wasnt long before从句”结构中，before是从属连词，表示“不久以后就”；而“It wont long before从句”结构中，before是从属连词，意为“不久就会”，引导时间状语从句。例：It wasnt longbeforehe came home.他不久后才（很快）回到了家里。例：It wont longbeforeyou get well again.不久你就可以恢复健康了。3. It be +点时间+ before 在“It be +点时间+ before从句”结构中，before是从属连词，表示“在之前；时间是”，引导时间状语从句。例：It was 4:00beforehe came to see you.他是四点后来看你的。4. It be +点时间+ when 在“It be +点时间+ when从句”结构中，when是从属连词，表示“当时是”，引导时间状语从句。例：It was 4:00whenhe came to see you.他来看你时，已是四点了。5. It be +段时间+ since 在“It be +段时间+ since从句”结构中，since是从属连词，引导时间状语从句。若从句中谓语动词是短暂性动词，表示“自从以来有多久了”；若从句中谓语动词是延续性动词，则表示“（多久）不了”。例：It was two yearssinceI joined the League member.我入团已三年了。（join是短暂性动词）例：It was many yearssinceI enjoyed myself like this.我已有多年没有像这么开心了。（enjoy是延续性动词）6. It be +时间+ that 在“It be +时间+ that从句”结构中，构成强调句，表示“就是时间才”。例：It was two years laterthatI came back from abroad.正是两年后我才回国的。7. It is / will be +段时间+ until 在“It is / will be +段时间+ until从句”结构中，until是从属连词，引导时间状语从句，表示“过了（要过）多久才”，until相当于before。例：It would be 10 yearsuntil / beforehe knew the truth.十年后他才得知真相。【温馨提示】（1）until用于肯定句，表示“直到为止”，谓语动词一般是延续动词，常见的有stay, work, study, play等，表示动作一直延续到until所表示的时间为止。例：Tell him to stay upuntilI get back.告诉他，等我回来后再去睡。（2）until用于否定句，表示“在之前；直到（才）”，谓语动词一般是终止性动词，常见的有come, arrive, leave, die等，表示动作到until所表示的时间时才发生。例：They wont come to any decisionuntilthey had a chance to discuss it wholly.等有机会全面讨论这个问题后才定夺。综合上述，句子结构千变万化，规则众多，用法奇特，但只要根据已有的学习经验和知识水平分析句子，理解用意，进一步进行信息整合，推理判断，便可找到更新的理解办法或途径，这样，无论多么难的句子都可以一一化解了。【经典演练】1. It was _ he came back from Africa that year _he met the girl he would like to marry. A. when; then B. not; until C. not until; that D. only; when2.- Have you know Dr. Jackon for a long time? - Yes, since she _ the Chinese Society. A. has joined B. joins C. had joined D. joined3. - Did his father come back early last night ? - Yes, it was not yet eight oclock _ he arrived home. A. before B. when C. that D. until【答案与解析】1. C考查强调句与时间状语从句辨析。句意：正是他那一年从非洲回来时，他才遇到了他的确想要结婚的那位姑娘。此处应是强调句型，被强调的对象是“not untilhe came back from Africa that year”,不是时间状语从句，而选项A，B和D项不合要求，故C项正确。2. D考查since时间状语从句。句意：自她加入汉语协会以来。据语境分析，此处since表示“自从以来”，而选项A，B和C均不合语义，故D项正确。3 B考查when时间状语从句。句意：当他回到家里时，还不到八点。据语境分析，此处it指时间，when引导时间状语从句，表示“当时候”，而选项A，C和D均不合语义，故B项正确。【能力提升】1. - 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. that D. before2. It was some time later _ we realized two or three years. A. until B. before C. that D. since3. How long is it _ we last saw each other in Shanghai ? A. since B. before C. until D. that4. That was really a special evening, its years _ he enjoyed himself so much. A. when B. that C. before D. since5. It seemed only seconds _ the boy finished washing his face. A. when B. before C. after D. since6. - What did she want to know, Tom ? - She wondered _ we could complete the experiment. A. when was it B. it was when that C. it was when D. when it was that7. Was it in 1939 _ the Second World War broke out ? A. that B. when C. until D. since8. It was two years _ I began to learn English. A. when B. since C. before D. that9. It was not until dark _ he found _ he thought was the correct way to solve the problem. A. that; what B. that; that C. when; what D. when; what【答案与解析】1.D考查before时间状语从句。句意：-你认为中国多少时间后才能把宇宙飞船发射到月球上呢？-或许两三年吧。据语境分析，此处before引导时间状语从句，表示“在之前，才”，而选项A，B和C均不合语义，故D项正确。2.C考查强调句与时间状语从句辨析。句意：就是一段时间以后我们才能弄清事实的真相。据语境分析，此处强调“some time later”, It be that 构成强调句式，而不是时间状语从句，而选项A，B和D均不合句式要求，故C项正确。3.A考查since时间状语从句。句意：我们最后一次自在上海见面后有多长时间了呢？据语境分析，此处应是since引导时间状语从句，表示“自以来”，而选项B，C和D均不合语义，故A项正确。4. D考查since时间状语从句。句意：那是一个特别的晚上，已有多年没有这么开心了。据语境分析，此处应是since引导时间状语从句，表示“自以来”，而选项A，B和C均不合语义，故D项正确。5. B考查before时间状语从句。句意：好像没大一会儿，那个小孩就把脸洗完了。据语境分析，此处应是before引导时间状语从句，表示“.才”，而选项A，C和D均不合语义，故B项正确。6. D考查强调句与时间状语从句辨析。句意：-她到底想知道什么，Tom? -她想知道我们完成这项实验的时间。据语境分析，此处应是强调句，被强调的对象是“when”,又因放在she wondered之后，随之构成宾语从句，将when提出以平衡句子，表示“.时候”，而选项A，B和C均不合要求，故D项正确。7. A考查强调句与时间状语从句辨析。句意：就是在1939年爆发的第二次世界大战吗?据语境分析，此处应是强调句型，被强调的对象是“in 1939”,不是时间状语从句，而选项B，C和D均不合要求，故A项正确。8. B考查since时间状语从句。句意：我自学英语以来，有两年时间了。据语境分析，此处应是since引导时间状语从句，表示“自以来”，而选项A，C和D均不合语义，故B项正确。9. A考查强调句与时间状语从句辨析。句意：直到天黑时，他才发现他所想到的正是解决这个问题的有效途径。据语境分析，此处应是强调句型，被强调的对象是“not until dark”,又在he found后跟了一个what引导的宾语从句，不是时间状语从句，而选项B，C和D均不合要求，故A项正确。1.It be +时间段before.过了多长时间才.：It was two days before he knew.过了两天他才知道.It was three years before he came back from abroad.过了三年他才从国外回来.2.It be+ 时间点 when.当.时候,时间是.：It was six when he arrived.当他到达时,时间是6点钟.3.It is / has been +时间段 since.(往往用非延续性动词）自从以来到现在已有多久,做.已经多长时间了：It is / has been five years since he died.他已经死了5年了.4.It is three years since they got married.他们已经结婚三年了.It is t