Avisa a mi hermano si la reunión cambia a última hora.

Notify my brother if the meeting changes at the last minute.

Breakdown of Avisa a mi hermano si la reunión cambia a última hora.

• mi: my
• a: to
• el hermano: the brother
• la reunión: the meeting

Questions & Answers about Avisa a mi hermano si la reunión cambia a última hora.

What verb form is Avisa?

It’s the affirmative imperative for tú (informal singular): a direct command meaning “Tell/Let [someone] know.” Other imperative forms:

• usted (formal): Avise
• vosotros (Spain): Avisad
• ustedes (plural): Avisen Negative commands: No avises, No avise, No aviséis, No avisen

Why is there an a before mi hermano?

Spanish marks the person who receives the warning/notification with a after avisar: avisar a alguien (de algo). Here a mi hermano is the person being notified (an indirect object-like role). This is required; you can’t say Avisa mi hermano without the a.

Can I replace a mi hermano with a pronoun?

Yes: use le for the person. With an affirmative command, it attaches to the verb: Avísale. You can keep both (common and natural): Avísale a mi hermano. Don’t write Avisa le (the pronoun must attach: avísale) in affirmative commands.

Where do pronouns go with commands and negatives?