I don't know what to do what在其中做什么语 我一直以为What只在疑问句中出现 而且是句首

what to do在i‘m very upset and don't know what to do中做什么成分、 【 I don't know what to do I don't know what to do中what to do是宾语从句吗? I don’t know what to do 这是动词不定式做什么成分? i don't know to do what 这句话到底错在哪里? I understand,but,I don't know what to do? I don't know what the teacher is saying中what做什么成分 i don't know to do what 对吗 找错----Sorry,I don't know what to do it 改错：I don't know what to do it. I don't know what to do for homework i don't know ()to do.填what还是how