A copula is “That part of a proposition which connects the subject and predicate; the present tense of the verb to be (with or without a negative) employed as a mere sign of predication.” It uses a linking verb to describe the subject, so is always either another noun or an adjective. Other verbs ...

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Why should a copula link two noun phrases of the same case?

http://english.stackexchange.com/a/30392/50720 motivated this question: To quote from the clear explanation: The rule for what [Fowler] and others consider technically right is ... that ...