It+is或has+段时间+since.doc

1. Its been six years since we last saw each other. 自从我们上次见面已经有6年了。It is/has been + 一段时间+since + 从句，意为“自从至今已经多久了” 翻译:1) It has been three years since they got married. 2) It has been three years since they stayed here. 答案：1)他们结婚已经三年了。2) 他们不在这儿已经三年了。 【拓展】It + be +时间段+before从句的两种翻译：若主句为肯定句式：过多久才若主句为否定句式：没过多久就It will be hours before he makes a decision.It was not long before she learned those poems by heart.It wont be long before they understand each other. 答案：要过好几个小时他才会作出决定。 她没过多久就背过了那些诗。 用不了多久他们就能互相了解 。【即学即练】It wasnt a few years _we met each other.A. since B. before C. until D. after 【解析】选B。句意：没过几年我们就见面了。考查句型It+ be +时间段+before从句。故选B。1.It is /has two years _he died.A. before B .since C. when D. after2. It will be five years _he meets you again. A. before B. since C. when D. after3. It was long _she came back.A. before B. since C. when D. after4.Itisalmostfiveyears_wesaweachotherlasttime.AAbeforeBsinceCafterDbecause答案：1.B 2. A 3.A 4.B高考题1. As is reported, it is 100 years _ Qinghua University was founded.(2011四川卷)A. when B. before C. after D. since2. It _ long before we _ the result of the experiment. (上海春)A. will not be; will know B. is; will knowC. will not be; know D. is; know1.C 2.C单句改错1. Many a book have been published this year.2.It is the first time that I had been here.3.It is/has been 3