I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的：I had not understood the problem until he explained it.为什么是had not understood 呢

I did not understand how love you I did not always understand这句话对吗?总感觉是I always did not understand I am afraid I did not make myself __(understand). He did not understand English. I did not understand why you did speak these words to me这句话的意思 I do not understand! I do not understand Yes,I did not understand.But,do some who understand you compared to me?把这句话翻译成中文 I did not understand you,can you repeat that,please?怎么翻译.. no,i can understand it.but you did not tell mewhat is your name什么意思? I care about you very much,you understand did not explain中文意思是啥? I don not understand是什么意思 I can not understand you. I do not understand love I did not ask Away from me,did not understand Chinese ah?I do not want to talk to you,do not bother me这什么意 yes so i am very happy do you understand if you not say the ture i will did not belive you foreve Did not understand your english 翻译一下 谢谢