I understand,but,I don't know what to do?

i understand most od you said ,but i can't understand ____a everythinf b antthing c something d nothing I understand.I know,but I still get not I understand I also can not ,but I can understand it I understand,but,I don't know what to do? No,I'd love to,but you have to understand me,I will as soon as the last i understand most of what you said,but i can't understand__ a everything b anything c something d.nothing I can make you——what I say,but you can‘t make yourself ——in englishA.understand,understand.B.understand,understood.C,to do ,do D.do ,to be donedo 是understand I understand most of what you said,but I can’t understand I think I understand I used to thike I could make you happy forever ,but now i understand i'm I love you,but you can't understand But I don't understand chinese翻译中文 I love you,but you can't understand I told him many times but he failed ( )(understand)it. But I am not understand very much中文意思? but I （could） not understand himbut I could not understand him.but I can not understand him.but I don't understand him.有何区别?是否可以互换?整句意思有何不同吗？ Actually I do not understand,but does not want to understand什么意思