Verbs which have an infinitive ending in UIR not GUIR are regular in the NOSOTROS and VOSOTROS parts only (like the stem changing verbs). The remaining partes of the verb are irregular e.g.CONSTRUIR- to build.
Verbs which have an infinitive ending in UIR not GUIR are regular in the NOSOTROS and VOSOTROS parts only (like the stem changing verbs). The remaining partes of the verb are irregular e.g.CONSTRUIR- to build.