I do not know whether he wil come to our party.中为什么不要能用if?解释具体些,

I do not know I do not know 请问 I DO NOT KNOW sorry,i do not know! Why I do not know I do not know how to do I do not know what you I do not know _____ your home. I do not want to know I do not know what you i do not know your write I do not know ! 甚么意思? i do not know 是什么意识 I do not know是啥意思? _______you know ,I do not music. not,I,know,her,do,sorry(.) Do you know I'm not? I do not know how to