关于I am sorry to hear that不是说不定式如果发生在谓语动词之前,是要用完成时have done的吗?那这里为什么不说I am sorry to have heard that呢?

I am sorry to hear that是什么意思? i am sorry to hear that.是什么意思? I am very sorry to hear that. I am sorry to that hear . I am sorry to hear that的中文I am sorry to hear that的中文 I am sorry to hear that 和i an sorry for hear that 的区别是什么 为什么I am sorry 后要加to do?例：I am sorry to hear that that I am to hear sorry.(连词成句） I am sorry to hear that怎么解释? i am sorry to hear that 什么意思 i am so sorry to hear that.so 是什么词性. I am very sorry to hear the new对吗 I am sorry to hear you are （）bad I am sorry to hear he was ( ) ill.(terrible) I am sorry for it 和i am sorry to hear that . i am sorry to hear that that you said I am sorry to hear that这是什么.是病句么- - I am sorry to hear that.Did she go and see a doctor?I am ____not. i am sorry to hear that和i am sorry to learn that 和i am sorry to know that哪一个比较好,写作用哪一句?