||The verbs 'to go' and 'to come' in the Brittonic languages have suppletive paradigms. The finite forms ar based on the stems a- < *ag- < *h₂eg̑- 'to drive' and el- < *pelh₂- 'to approach'. In the paradigm of 'to go', these forms are used uncompounded, while in the paradigm of 'to come', they contain the preverb *tu-. In Middle Welsh, some Imoerative forms are based on *ret-e/o- <*ret- 'to run'. The verbal nouns of 'to come' Welsh mynet, Breton monet originate from PIE *menH- 'to step, to stamp' (?). The verbal noun of 'to go', Breton donet contains the same root prefixed with *tu-, i.e. *de-vonet, cf. also Old Breton diminet. The Welsh verbal noun dyfod 'to come' contains *tu- + bod 'to be' based on PIE *bʰweh₂- 'to become, to grow'.