Subject Pronouns and Estar Subject Pronouns Subjects and subject pronouns are optional in Spanish, you can always use them if you are not sure. The pronoun replaces the subject The pronouns I – Yo You (familiar) – tú You (formal) – usted, Ud. He, it – él She, it – ella We – nosotros, nosotras You (plural) – ustedes, Uds. They – ellos, ellas The verb Estar (to be) Estar means to be Estar is an infinitive verb Infinitive means an unconjugated verb, a verb without a subject A conjugation of a verb means to give it a subject The verb Estar (to be) Yo Tú Usted Él Ella Nosotros –as Ustedes Ellos –as estoy I am. estás You are. (familiar) está You are. (formal) está He is. está She is. estamos We are. están You (all) are. están They are. The verb Estar (to be) Yo Tú Usted, él, ella Nosotros –as Ustedes, ellos -as estoy I am. estás You are. (familiar) está You are, he/she is. estamos We are. están You (all), they are.