The primitive conventional right, as the original form of right, is united in naturality and sociality, in egality and distinction, and in spontaneity and must.
As to dynamic modality, it can always be hypothesized in a conditional protasis, is always subject to tense distinction, and does not shift its orientation under the influence of interrogation.
The distinction between pastness or futureness and “the” past or “the” future is graphically illustrated by imagining a movie of, say, the egg being dropped on the floor and breaking.