It's not my fault可不可以改成It isn't my fault?

It's not my fault可不可以改成It isn't my fault? It’s not my fault. It's my fault, It's not my fault还是that's not my fault I don’t think that’s my fault. Isn’t it? "why isn't nancy going to meet us?"It's my fault.I forgot al Nancy isn't here.It's my fault,I forgot all about ___ her 英语翻译Rachel:Come on,this isn't funny.She thinks it's my fault 求翻译:Don't blame me,it's not my fault. It's my fault ,I'm sorry. It's my fault,please pardon me It is all my fault