since 用在一般过去时和现在完成时中的区别He has worked there since 1990.He worked there since 1990.这两句话中都用了since .两句话的意思有什么区别?

分类: 作业答案 • 2022-04-14 14:36:23

问题描述：

since 用在一般过去时和现在完成时中的区别
He has worked there since 1990.
He worked there since 1990.
这两句话中都用了since .两句话的意思有什么区别?

答

since 用在一般过去时和现在完成时中的区别He has worked there since 1990.He worked there since 1990.这两句话中 都用了since .两句话的意思有什么区别?