Why is 'thuirt' different from other past tenses?
Carson a tha 'thuirt' diofraichte bho ghnìomhairean san tràth chaithte?
Why is there no do with an , cha or nach ?
An tuirt, cha tuirt and nach tuirt were historically an d’ thuirt, cha d’ thuirt and nach d’ thuirt. Over time, the d’ thuirt part came to be written as duirt and then finally tuirt.