I really don't know ( )里面应该填what to do还是how to do,或者两个都可以?

I really don't know ( )里面应该填what to do还是how to do,或者两个都可以?
I really don't know ( )里面应该填what to do还是how to do,或者两个都可以?

I really don't know ( )里面应该填what to do还是how to do,或者两个都可以?
填what to do,what to do=how to do it.这样一说你就明白了.

是what to do;如果你要用how to do的话要用how to do it。

两个都可以

what to do

都可以

what to do ,

填what to do
how to do缺宾语，应该how to do it才正确

是都可以，一个表示不知道做什么，一个表示不知道怎么做。
具体用哪个看语境

what to do 是对的，因为他可以做名词性从句，在这里作宾语
how to do 不对 它不可以作宾语，如果选它就要在后面加一个it 构成一个名词性从句

英语试卷上的话选填what to do意思是我真不知道做什么,how to do后面最好加上it，我不知道怎样做（这件事）什么的最好有个指代

what to do.how to do后面必须有宾语

i really don't know what to do. 我实在不知道该做什么
how to do 不能这样直接用作宾语。I really don't know how to do it. 我实在不知道该怎么做。