since的用法：since后面可以接什么
问题描述：
since的用法：since后面可以接什么
举个例子：since about six years 这句有错误吗?
应该怎样改正,为什么?
答
since about six years 是错误的.
since 用于现在完成时中,后面跟过去的时间或者跟一般过去时的动作.
例如：
She has lived here since about six years ago.
=She has lived here since 2007.since for about six years正确吗？since for about six years是错误的。正确的说法是：since about six years ago或者是 for about six years