to know what to do is wisdom麻烦问下 这两个不定式组合在一起,第一个充当什么语,第二个又充当什么语

i don't know what to do I know what to do for I understand,but,I don't know what to do? I DO not know ( ) it today A What to do B how to do C to do what 改错.I want to know what do next .______ I need to know what do you want for all? I do want to know what really happened.翻译 翻译I don't know what to say or do. i don't know to do what 对吗 I am do not know what to say(同一句) I do not know what you mean to say is, i don't know ()to do.填what还是how at that moment i ---(know)what to do at all I know what to do it可以吗 i dont know what to do next同义句i dont know what _____ _____next i what to do i do not know what to do .为什么不用 what does ,what did 为什么是Do you want to know what I do?而不是what am do?