nPast tense: movement into the completed; bounded, hypothetical, nonactual, counterfactual events
nPresent tense: slightly extended; performatives, in situ narrative, incompleteness, stativity, genericity
nFuture tense: nonactual, hypothetical, inception, prediction, volition, supposition
nSome languages are tenseless, almost all have only 2 or 3 basic tense distinctions
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