sorry to hear that 的答语是什么?

sorry .“sorry”的答语是什么? 主系表结构后面的 to do 形式是什么成分?比如?I 'm sorry to hear that 里的to hear Iam sorry to hear that? i am so sorry to hear that.so 是什么词性. I'm sorry to hear that.的意思! l am sorry to hear that的意思 I'm sorry to hear that.的中文意思 i‘m sorry to hear that的回答 We are -------(raal)sorry to hear that. i am sorry to hear that.是什么意思? I'm sorry to hear that .作文 I‘m sorry to hear that.