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1、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 /
2、 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
3、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
4、”。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+ unt
5、il 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）un
6、til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 _ h
7、e 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 ear
8、ly 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
9、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 _
10、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 _ t
11、he 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. u
12、ntil 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
13、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，
14、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
15、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
16、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
17、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 three years since they were married.他们已经离婚三年了.（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”.）再如: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.5.It wont be long before.:不久.It wont be long before we meet again.我们不久会再见面.4材料2