How to Say "i warn" in Spanish
The Spanish word for “i warn” is “advierto” — A2 level. This is a very common word in everyday Spanish.

Examples
Te advierto que esa calle es peligrosa de noche.
I warn you that street is dangerous at night.
Si no estudias, advierto que suspenderás el examen.
If you don't study, I warn you that you will fail the exam.
The 'I' Form Irregularity
The verb advertir (to warn) is irregular. When you say 'I warn' (yo), the 'e' in the middle changes to 'ie', giving you 'advierto'.
Using 'Advierto' with 'Que'
You often follow 'advierto' with the word 'que' (that) to introduce the thing you are warning about, like 'Advierto que el jefe está de mal humor' (I warn you that the boss is in a bad mood).
Forgetting the Stem Change
Mistake: “Yo adverto”
Correction: Yo advierto. Remember that the 'e' changes to 'ie' in most present tense forms, including 'yo'.
Related Translations
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.