i am sorry后动词加to do还是doing同标题

i am sorry后动词加to do还是doing同标题 BE动词后可不可以加to 比如I'm to sorry but i love You 为什么I am sorry 后要加to do?例：I am sorry to hear that 现在进行时后面加动词短语例如I am helping you to do housework 对不对 哪些动词后加to do ,what I am looking forward to is nothing else but_后加动词的什么形式/ I am sorry to myself i am sorry i do not see 动词后的动词加ing和to do谁知道 翻译：I am sorry to do sth.in ordre to do. I am sorry that I （）（forget）to post the letter for you 动词填空. i'm sorry to be so short-temperesed为什么是过去式..还用AM还有为什么有2个BE动词. 句子的结构：主＋系＋表 后面就要加to do 这是固定搭配?如I am sorry to hear that. 动词短语后什么时候加ing什么时候加to do I am sorry to hear that .翻译.还有为什么动词是用不定式吗?为什么? I am sorry to do 和I am sorry for doing是同义句还是各自有不同的用法?比如 I am sorry to hear that 和 I am sorry for losing your book,它们能否变为同义句：I am sorry for hearing that 和 I am sorry to lose your book? 英语翻译I am 『Sorry.』I ｛love} you ,But have 《Nothing》 to do with you. I am sorry.In fact I do not want to hurt you