comenzasteis
Comenzasteis is the second person plural preterite form of the verb comenzar, used to indicate that you all began an action in the past. It is common in Spain and other regions that use the vosotros form. The verb comenzar can be used interchangeably with empezar in many contexts, though empezar is generally more common in everyday speech, while comenzar can carry a slightly more formal or written tone.
Conjugation notes: in the pretérito perfecto simple, the forms for comenzar are: yo comencé, tú comenzaste, él/ella/Ud.
Uso y matices: comenzar suele emplearse para indicar el inicio de una acción o proceso, a veces
Ejemplos: Ayer vosotros comenzasteis el curso de español. Cuando comenzasteis a estudiar, la profesora explicó las