after then和since then的区别RT
问题描述：
after then和since then的区别
RT
答
二者都是“从那以后”的意思,都可作连词,一般放在句中
since then 后接完成时,从那以后直到现在
after then后接过去时
如：
I have known her since then.
I kept in touch with her after that.