Er ... mood? Nouns come by the case. Verbs only in tens. :
de

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Indeed -- thanks, equill, for repairing a deficiency (alas, but one of an infinite number) in my education. My English (er, American) teachers consistently referred to this as the subjunctive case, so I never thought twice about whether it was correct. I had enough of a challenge keeping the dysfunctional nominative case distinct from the adjoint retrophilic.