they dont know what to do with themselves 改为含宾语从句的复合句

they dont know what to do with themselves 改为含宾语从句的复合句

疑问词whom、what、which、when、where、how、whether（不能用if）后面加动词不定式可以构成一种特殊的动词不定式短语,它在句子中可以作主语、直接宾语、表语、介系词宾语等,如：
How to earn daily bread by my pen was then the problem.
He didn't know whether to refuse it or not.
The difficulty was how to cross the river.
I asked him how to learn English.
这几个句子,可以与疑问词引导的名词性从句互换,如：
How I should earn daily bread by my pen was then the problem.
He didn't know whether he should refuse it or not.
The difficulty was how we could cross the river.
I asked him how I could learn English.
所以你给出的句子,带有“疑问词加动词不定式”的结构,改法如下：
They don't know what they should do with themselves.
希望我能帮助你解疑释惑.