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stehen versus aufstehen (auxiliary verbs) - WordReference Forums
Hi and welcome! Unlike stehen, aufstehen is classified as a change of state. In a similar vein, sterben, umkommen, aufwachen, einschlafen, entstehen and others form the perfect tense with sein, although they do not involve motion. The rules for auxiliary verbs are necessarily rules of thumb. Some verbs, like bleiben, defy taxonomy. Hope this helps, Jana