How can a Basque finite verb include information about the subject and objects?

In the Basque language, the finite verb functions as a comprehensive summary of the sentence's noun phrases by inflecting for tense, voice, person, number, and mood.1

Rather than relying solely on independent pronouns, the verb can incorporate up to three distinct personal references simultaneously, specifically marking the subject, direct object, and indirect object. For example, while da simply means "is," the verb dio translates to "he has it for him," effectively encoding the subject ("he"), the direct object ("it"), and the indirect object ("for him") within a single word. In certain contexts, the verb may also include a reference to the interlocutor.1