How to Say "to assure" in Spanish
The Spanish word for “to assure” is “asegurar” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
verbB1
to promise or state with certainty

Examples
Te aseguro que la reunión empieza a las diez en punto.
I assure you that the meeting starts at ten sharp.
El director aseguró que el proyecto estaría terminado para el viernes.
The director guaranteed that the project would be finished by Friday.
Asegurar vs. Asegurarse
When you 'asegurar' (without 'se'), you are making a promise to someone else. When you 'asegurarse' (with 'se'), you are verifying something for yourself.
Incorrect Use of Subjunctive
Mistake: “Aseguro que sea verdad. (Incorrect verb form)”
Correction: Aseguro que es verdad. (Use the normal verb form (indicative) because 'asegurar' expresses certainty, not doubt or desire.)
Related Translations
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