i do not know this sentence means what是病句吗

I do not know why this happened! Why l do not know.This is my feel.Understand?I do not know your mean. I do not know I do not know 英语翻译I do not know answer this question,but I think he ----.A do B does 请问 I DO NOT KNOW sorry,i do not know! Why I do not know I do not know how I can answer this question. I do not know___ ___ ____this question. At this point,I really do not know what I feel for you I do not know how to do -Are you() with this new machine - Sorry,I do not know it well.Let's ask Mr wu for some help.空格里填什么啊 英语翻译I do not know what shipping cost would be.I send everything through U.S.P.S.How about 50.00 dollars for shipping and if it does not total up to this amount I will refund the balance to you.I do not think it should be much more than this.S It's not suddenly ,it's always .Maby i know why ,but i really don't know how to do -I do not know this word（单词）.please give me your __. I do not know if this is right or wrong.中文意思 i do not know this sentence means what是病句吗 We are what le?Why I will become like this,do not know who is wrong!