I think this is what you mean: I'm not sure who is charging it.
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Carter LeeWhy not?That and the perform the same function, specifying person who is charging. It would be like saying the the person.
Carter LeeWhy you remove the 'the person' ? If I want to exaggeration itYou can write this:
Carter Lee"I'm not sure about that the person who is charging it"What do you mean by "charging it"? What situation are you describing?