可以写 I do understand吗

可以写 I do understand吗 I do not understand! I do not understand I do not understand love I understand. 和 I do understand. 有什么区别. Doyou understand.--Yes,I quite understand.这个对话`把quite去掉可以吗?为什么 Do you understand?回答-Yes,I quite understand.-Yes,I understand.哪个回答对? do you understand what I said? Do you understand what i mean? I do not think you understand my you do not understand how i feel I do only oneself understand什么意思? I do not understand love AEttir In fact,I do not understand how you still do not understand,do not understand,do not know I love you翻译下! 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？ what do you mean?I do not understand it! Why do you dissatisfied,I do not understand 翻译中文!