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It is best to avoid usages in which where follows nouns that are unrelated to the ideas of place and space: This is a case where we must confer with a specialist.This is a situation where the accountants are wrong. In formal writing, in which would be more appropriate than where in both these sentences. The preposition from is needed with where when the context involves a point of origin: Where did that cat come from?From where we sit, we can see the stage clearly. In formal writing, the redundant, dangling use of at with where should also be avoided. Thus: He doesn't know where the car is not He doesn't know where the car is at. The preposition to is superfluous with where when where is used in contexts involving destination. Thus: Where are you going? not Where are you going to?
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