i don't know to do what 请分析一下句子成分,为什么to do what不能做宾语

I don't know what to do中what to do是宾语从句吗? 请问I don't know what to do next.中的what to do next是宾语从句吗?为什么? I don't know what to do.为什么不是I don't know what to be done.请高 I don't know what to do 英语宾语从句问题,I don't know what to do with the problem.为什么用what?我 What should I do.引导宾语从句.还有就是例：I don’t know what to do 为什么I don't know what to do成立而I don't know how to do不成立 正常译法是i don't know what to do ,为什么不能用i don't know how to do I don't know what to do next 改成宾语从句 I don't know what to do (改为含有宾语从句的复合句） I don't know what to do next.改为宾语从句 I understand,but,I don't know what to do?