I wanted to know if I can use possessive pronoun after "There is no".
There is no my neighbor who/whom I don't like.
I also wanted to know which word I should use - "who" or "whom"?
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We cannot usually put a possessive between another determiner and a noun. We can use determiner + noun + of + possessive instead.
My work is no business of yours.
There is no neighbour of mine whom I don't like.
We use whom, because it functions as an object in the clause .