2015年卫生职称英语语法：比较since和for
2014-09-05 09:23 来源：医学教育网
2015年职称英语考试已经开始备考，本阶段应该多整理一些基础词汇和语法。为此，网校特整理了“2015年职称英语考试语法知识”供您参考，希望对您有帮助！
比较since和for
Since 用来说明动作起始时间，for用来说明动作延续时间长度。
I have lived here for more than twenty years.
I have lived here since I was born……
My aunt has worked in a clinic since 1949.
Some new oilfields have been opened up since 1976.
I have known Xiao Li since she was a little girl.
My brother has been in the Youth League for two years.
I have not heard from my uncle for a long time.
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