I don't know what i can do to help her.(改为同义句) I don't--- --- ---to help her.
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I don't know what i can do to help her.(改为同义句) I don't--- --- ---to help her.
应该是四空吧,楼主是不是打错了?
I don't know what I can do to help her.
= I don't (know what to do) to help her.
know how
know ,how,