I don't know what to do next 改成宾语从句

I don't know what to do next 改成宾语从句 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 next.改为宾语从句 I don't know what to do中what to do是宾语从句吗? I don't know what to do (改为含有宾语从句的复合句） What should I do.引导宾语从句.还有就是例：I don’t know what to do i don"t know what to do (next) 和i don"t know how to do (next 英语宾语从句问题,I don't know what to do with the problem.为什么用what?我 i don't know how to do next还是what to do next I really don't know ( ).A.what to do the next B.what to do i I don't know what to see.(改为宾语从句） I don't know ______ ______ We don't know②what to do.把②处改为宾语从句