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

Examples
Avísame cuando llegues a casa.
Let me know when you get home.
Si cambias de planes, avísame.
If you change your plans, let me know.
Avísame si necesitas algo más.
Tell me if you need anything else.
The 'Me' at the end
In Spanish, when you tell someone to do something directly, small words like 'me' get stuck right onto the end of the action word.
Why the accent?
We add an accent to the 'í' to make sure the emphasis stays on the right part of the word even after we've added 'me' to the end.
Forgetting the accent
Mistake: “avisame”
Correction: avísame. Without the accent, the pronunciation would change incorrectly. Always include the accent when attaching 'me' to the command 'avisa'.
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