An infinitive is the ‘to’ form of a verb, for example 'to play', 'to watch', 'to be'. In Spanish infinitives end in 'ar', 'er' or 'ir'.

A conjugated verb is broken down into 'I', 'you', 'he/she/it', 'we' and 'they'. Regular verbs are conjugated to set patterns. Irregular verbs are not conjugated to set patterns.