英语中I am sorry to hear that和I am sorry to heard that有什么区别?

英语中I am sorry to hear that和I am sorry to heard that有什么区别? I am sorry to myself 英语中不定式的完成式的有关问题.I am sorry to have keep you wait.I am sorry to keep you wait.I am sorry to have keep you wait（for so long time.）.我很抱歉让你等了这么久I am sorry to keep you wait.我很抱歉请你等一 I am sorry I have to 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. 翻译：I am very sorry to you I am sorry to see 现在就要 I am sorry to trouble you but. I am sorry to that hear . I am sorry just to trouble you! I am sorry to trouble you 用 i am sorry to .造句 I am sorry to one forever是什么意思? 为什么I am sorry 后要加to do?例：I am sorry to hear that I am sorry to hear that的中文I am sorry to hear that的中文 __________________ that the experiment has not been a successA.I am sorry sayingB.I am sorry to sayingC.I sorry to sayD.I am sorry to say