These are plural subject pronouns. They translate into English as 'they (all male or mixed company)', 'they (all female)' and 'you'.
The first two pronouns-ellos and ellas-designate a third person; they are used to reference people you're speaking about (a third party), not the persons you're speaking to.
The last pronoun-ustedes-designates a second person; it's used to address people you're speaking to (a second party), not the people you're speaking about.
When a plural subject pronoun is used, the verb is conjugated in its third-person plural form. Even though ustedes is a plural second person subject pronoun, the verb is still conjugated in third person plural.
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