17-1: regularmente: (i.e. según reglas; naturalmente) presumably.
17-2: no te expongas: cf. note no seas, p. 6, 7.
17-3: se la ha fumado: for se cf. note lo que me digo, p. 7, 5.
17-4: El que no asista, etc.: a very loosely constructed sentence. Translate: If either of us does not appear, etc.
18-1: alaveses: natives of Álava, a Basque province in the north of Spain.