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1、It is + 时间段 + since “自从.以来有一段时间了”。It is + 时间点 + when “当的时候时间是”。It is + 时间段 + before “在之前有一段时间”。,It was past one oclock when he came in. It wont be long before they understand each other. It was long before she came back. It will be long before we meet again. It will be five years before he meets you
2、 again. It is / has been four days since I caught a cold. It is / has been two weeks since we met last.,他哥哥入伍三年了。 他哥哥退伍三年了. 他病了两星期了。 他病愈两星期了。 他们结婚到现在已经十年了。 他到这儿已经二十分钟了。 。,不久后我们就能做好旅行的准备工作了。 三年以后我们才能再次相见。 一个小时以后他才完成了工作。 他完成工作（到现在）已经一个小时了。 他在这儿待了约有十分钟。,练一练： 1. He went abroad in 1997 and has never come
3、 back. It is eleven years since he _the company at home. A. takes charge of B. took charge of C. is in charge of D. was in charge of 2.They asked me to have a drink with them.I said it was nine years since I_a good drink. A. enjoyed B. was enjoying C. had enjoyed D. had been enjoying,3. It was about
4、 midnight _ we found the lost child, crying under a tree. A. that B. until C. when D. where 4. It was six days ago _ I spoke to you about this matter. A. that B. unless C. since D. until,5. It was ten _ he stood at aunts door and rang the bell. A. when B. until C. since D. that 6. I think it wont be
5、 long _ they understand each other. A. when B. until C. since D. before,7. It was evening _ we reached the little town of Winchester. (天津卷) A. that B. until C. since D. before 8. -Did Jack come back early last night? -Yes. It was not yet eight oclock _ he arrived home. (福建卷) A. before B. when C. that D. until,9. It _ long before we _ the result of the experiment. (上海春) A. will not be; will know B. is; will know C. will not be; know D. is; know 10. As is reported, it is 100 years _ Qinghua University was founded.(2011四川卷) A. when B. before C. after D. since,