Suppletion according to aspect or tense is extremely rare, mainly concerning go - gaan (Engl. 'go - gone'; aspect). In the acrolect, the suppletive copulas iz - waz can be heard (tense). Note also that many verb stems are seemingly derived from an English past tense form (in reality, most of them are British dialectal forms), e.g. marid ‘to marry’, lef ‘to leave’, etc.