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1、精品文档1 . It is some time（一段时间）+ since 引导的时间状语从句=It has been some time（ 一段时间）+ since引导的时间状语从句该固定句型意思是自从以来已经多久时间了 ”。2 .其中要求since引导的从句必须采用一般过去时，而主句是一般现在时或现在完成时。3 .补充：该从句的谓语动词是瞬间性动词时，从句正常翻译； 而如果该从句的谓语动词是延续性动词作，从句必须作否定翻译。 如：It is two hours since he left the classroom.自从他离开教室以来，已经两个小时了。It is three years si
2、nce he worked there.自从他不在那儿工作以来，已经三年了。例句：1. It is / has been four days since I caught a cold.我感冒已四天了。2. It is / has been two weeks since we met last.自从我们上次见面以来已过了两周。我们会发现It is +段时间+ since .句型”在翻译成中文时，有绝然相反的两种意思，一是，：。做。有多长时间了。 另一是：。有多长时间没做。了。”怎样以简洁的讲解让学生明了。我的意思是：先让比较两个句子的意思（中英文对照）。如，It is five years
3、since he became a soldier.他当兵已经五年了。It is five years since he was a soldier.他不当兵已经五年了。再如，他病了两星期了。他病愈两星期了。It is two weeks since he fell ill .It is two weeks since he was ill.让学生观察since从句中动词的特点吧。第一种情况的动词是短暂性动词。表示从这点开始。而第二种则是状态性的，可延续的。练一练：1. He went abroad in 1997 and has never comeback. It is eleven ye
4、ars since he thecompany at home.A. takes charge of B. took charge of C. is in charge of D. was in charge of*答案选D不选B2.They asked me to have a drink with them.I said it was nine years since I agood drink.A.enjoyed B. was enjoying C. had enjoyed D. had been enjoying* 答案用C3.This is really a splendid evening. Its years I enjoyed myself so much.1欢立下载A. when B. that C before D .since精品文档欢迎您的下载,资料仅供套考!致力为企业和个人提供合同协议， 策划案计划书，学习资料等等打造全网一站式需求 2欢在下载
