If there is anything in this world about which I know positively nothing, it is ...
If there is anything in this world about what I know positively nothing, it is ...
In ordinary modern English, "which" is correct and "what" seems like an error. My feeling is that you may find instances of this use of "what" in old writing or dialect.
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In ordinary modern English, "which" is correct and "what" seems like an error. My feeling is that you may find instances of this use of "what" in old writing or dialect.
64801965Is thisAre these two sentences correct?
Note above how to ask your question.
CJ