referred to as stem-changing verbs. Examples include pensar ("to think"; e.g., pienso ["I think"]), sentarse ("to sit"; e.g., me siento ["I sit"]), empezar ("to...

vuelto and poner → puesto, there are devolver → devuelto and componer → compuesto; alongside decir → dicho there is predecir → predicho (but note bendecir...