since后加现在完成时和一般过去时的区别比如It's three years since he has worked there.和It's three years since he worked there.有什么区别
问题描述：
since后加现在完成时和一般过去时的区别
比如
It's three years since he has worked there.和
It's three years since he worked there.有什么区别
答
第一句：
从他不在那里工作开始到现在,已经有三年了.
第二句：
他在那里工作已经三年了.
加现在完成时,意思是已经停止了相关动作；
加一般过去时,意思是这个动作持续了多长时间.