but I do not konw how to do it

but I do not konw how to do it 为什么不能在konw后面直接加not 比如i don't konw how to do it. I really don't konw how to do about it To lose you,I do not konw how to do ;I love you I don't konw what to do.=I don't konw how to do it .为什么what不 i do not really konw what to i do not real konw what to do 哪 don't konw what to do about it don't konw how to do about it How to do it?I want to konw.（合并为一句） I want to do something very,very,but do not know how to do w i don’t konw ().B.what to do C.how to do it 我觉得两个都选,这道题好奇怪.. I do not know how to do i do not know how to do it、what to do