Of course Inma, I should have known that!
Sorry to have bothered you but thanks for the clear explanation.
"Sube" in "Sube al ático" is the imperative of subir for "tú", not "usted". If we wanted this whole sentence as a formal one, we'd say:
Suba al ático sin caerse.
Here "suba" is the imperative for usted (which is the present subjunctive form of the verb), and the pronoun changes from -te (for informal tú) to -se (for formal usted).
I hope this clarified it.
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