I know i can do it.语法有错误吗?know和do都是动词可以吗?

I don't know.Do it how can i I know that you can do it follow me . I do not know how I can do it同一句能改为I do not know what I can do.. 填个词i don t know what I can do about it,I’m completely____（迷茫,不知所措) i can work whenever i want now make me proud i know you can do it if i could . —— can you work and study at the same time?I can do it.I know I can. I know i can do it.语法有错误吗?know和do都是动词可以吗? I want to know how I can do it(变简单句) i don't know i can do it if not now选择AwhereB.whyC.whenD.how 改为同义句：I don't know how I can do it. I do not know what I can do about it.I am completely at a loss 翻译一下这句话 Yes i can do it What can i do it Maybe I can do it I do it because I can do it,I can do it because I Yes But if you know you will do it.I think you can do well Do you know Christmas?_______________________________________________.a、I can’t do so.b、It’s interesting.c、Yes,I know a lot about it.d、No,I won’t. I believe I can do it