I don't know what to do next.改为宾语从句讲讲理由

I don't know what to do next.改为宾语从句讲讲理由
I don't know what to do next.改为宾语从句
讲讲理由

I don't know what to do next.改为宾语从句讲讲理由
I don't know what I should do next.

I don't know what I should do next .

I don't know what I will do next.
原来的特殊疑问词+to做状语 改成句子 变成陈述语序 加人称（主语）和动词（谓语）
就可以了