Is this usage correct?
The park he talked about before is near the station.
This is an informal use of "before" to mean "earlier". It is OK in conversation but isn't suitable for formal writing. In formal writing use "earlier" instead.
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This is an informal use of "before" to mean "earlier". It is OK in conversation but isn't suitable for formal writing. In formal writing use "earlier" instead. ("before" is OK in all contexts, formal or otherwise, if you say what it's before, e.g. "before he arrived" or "before breakfast".)