题目内容：

the woman to whom you were talking just now is Mary 's mother
为什么要加 to 还有为什么用were 不是用was吗?

优质解答

我给你把主句从句拆看,你看下
the woman is Mary 's mother 这是主句 一点问题都没有吧
to whom you were talking just now 调整下语序,并请理解whom代替the woman
you were talking to whom（the woman）just now ,看到to是怎么回事了吗?talk to sb 和某人谈话；看到were是怎么来的了吗?根据主语you选are,根据just now改成were