1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student
奇幻森林 The Jungle Book
仲夏夜 Midsummer Night
体育锻炼 Sports in China
生活需要正能量 Life Needs Positive Energy
亲近大自然Get Close to the Nature
英语口试之我见 About Oral English Test
娱乐英语资讯:Feature: Chinese films and TV programs are more about kung fu
十年以后After Ten Years
中国的教育Chinese Education
医学热 The Fever About Medical School
你还相信爱情吗?Do You Still Believe in Love?
公益活动 Public Benefit Activities
娱乐英语资讯:Hollywood star Robert de Niro visits Cuba
美好的一天 A Wonderful Day
为什么要学习英语? Why We Need to Learn English?
水的重要性 The Importance of Water
我的笔友My Pen Friend
早起的好处 The Good Sides of Waking Up Early
应对网络犯罪 Deal With Cyber Crimes
如何预防禽流感 How To Prevent Bird Flu
那些逝去的青春 Those Fading Youth
旅游的意义 The Meaning of Travel
2016考研英语作文预测:雾霾治理和环保
2016考研英语作文预测
改变自己 Change Ourselves
互联网信息 Internet Information
微笑的重要性 The Importance of Smile
关于电子书的利弊Positive and Negative Aspects of E-books
亚健康的起因 The Cause of Sub-health
遵守诺言 Keep My Words
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