将划线部分改写为疑问句+动词不定式形式

问题描述:

将划线部分改写为疑问句+动词不定式形式
The problem is where I can put the desk.划线部分:where I can put
He wasn't sure who he should help.划线部分:who he should
请附上讲解,

The problem is where to put the desk.
He wasn't sure who to help.
The underlined parts are object clause,which can be replaced by indefinite form.who to help 也行吗,总觉得别扭