请问for和since的区别是什么?
问题描述：
请问for和since的区别是什么?
答
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 hav...