帮忙改一下这个英语句子中的错误

问题描述:

帮忙改一下这个英语句子中的错误
That's really kind of you to say so.

改成It's really kind of you to say so.
be kind of sb.to do sth.是固定搭配.而这句话是动词不定式做主语,为了防止句子头重脚轻,所以用it来做形式主语.