为什么I am sorry 后要加to do?例：I am sorry to hear that

为什么I am sorry 后要加to do?例：I am sorry to hear that I am sorry to myself 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? I am sorry to hear that .翻译.还有为什么动词是用不定式吗?为什么? 听到这件事我很难过的英文I am sorry to hear that.为什么不可以是I am sorry to hear this. 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