pronoun
1
BAD : He wanted to get to Paris, where his uncle lived there.
GOOD : He wanted to get to Paris, where his uncle lived.
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When where is used to begin a relative clause, it is not followed by there . Compare: 'Every weekend she drives down to London. Her parents live there.' 'Every weekend she drives down to London, where her parents live.'
2
BAD : The box where she kept her jewellery in had disappeared.
GOOD : The box where she kept her jewellery had disappeared.
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When where begins a relative clause, it is not followed by in, at, for, etc : 'We went to see the house where Shakespeare lived.'
Compare: 'The box that/which she kept her jewellery in had disappeared.'
3
See note at WHAT 3 (↑ what )