How to Say "be sure" in Spanish
The Spanish word for “be sure” is “asegúrate” — A2 level. This is a very common word in everyday Spanish.
Examples
Asegúrate de llevar tu pasaporte antes de salir.
Make sure you take your passport before leaving.
El perro está bien. ¡Pero asegúrate de cerrar la puerta con llave!
The dog is fine. But make sure you lock the door!
Antes de comprar el boleto, asegúrate de que la fecha sea correcta.
Before buying the ticket, be sure that the date is correct.
The Command Form
This word is a direct command. It tells tú (you, informal) what to do right now.
The Attached Pronoun
When you give a positive command in Spanish, the reflexive pronoun ('te' for tú) is always stuck right onto the end of the verb. 'Asegura' (assure) + 'te' (yourself) = 'Asegúrate'.
The Accent Mark
The accent mark on the 'u' (ú) is essential! It tells you where to put the stress when you say the word, since adding 'te' would otherwise shift the natural stress.
Forgetting the Accent
Mistake: “Asegurate (pronounced ah-seh-goo-RAH-teh)”
Correction: Asegúrate (pronounced ah-seh-GOO-rah-teh). The accent is needed to keep the stress on the correct syllable.
Using it for Formal Situations
Mistake: “To a boss: 'Asegúrate de firmar esto.'”
Correction: Use 'Asegúrese' for formal situations or when speaking to someone you call *usted*.
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