speak to sb.并非“铁板一块”。具体来说，speak 是不及物动词，to sb.是介词短语。

如需要的话，speak to完全可以被其他词语所分隔，如副词、介词短语等，为了强调“说话的方式”，像rudely, like that。例如：

Tom told me that Mary spoke rudely to you yesterday. You must have been very angry. 汤姆跟我说昨天玛丽跟你说话是很粗鲁,你当时肯定很生气。

If my son were to speak like that to me, I would tick him off. 如果我儿子对我那样说话的话，我一定会训他一顿。

I don't know how you can speak like that to your mother. 真想不到你怎么能那样对你母亲说话。

If he says something like that to me again, for two pins I'll hit him! 如果他再对我说那些话, 毫无疑问我要揍他!