Spanish Phrase
Confirma quién lo firmó.
Meaning
The sentence asks someone to verify the identity of the person who signed a document or item. It is a direct, concise request often used in administrative or business contexts.
When to use
Use this phrase when you need a quick confirmation about the signer of a contract, receipt, or any written material. It works well in informal spoken Spanish (tú) and in written notes or emails that keep a friendly tone.
✦Grammar Breakdown
Confirmaquiénlofirmó.
Imperative (tú) - Confirma
‘Confirma’ is the informal affirmative command of ‘confirmar’ for the second‑person singular (tú).
Interrogative pronoun - quién
‘Quién’ (with accent) introduces a question about a person; it always carries an accent in written Spanish.
Direct object pronoun - lo
‘Lo’ replaces a masculine singular noun (e.g., ‘el documento’) that is the object of the verb ‘firmó’.
Preterite - firmó
‘Firmó’ is the third‑person singular preterite of ‘firmar’, indicating a completed action in the past.
🗨In Conversation
Confirma quién lo firmó.
Confirm who signed it.
Fue María quien lo firmó.
It was María who signed it.
✕Common Mistakes
Confirma quien lo firmó.
The interrogative pronoun must carry an accent: ‘quién’.
Confirme quién lo firmó.
‘Confirme’ is the formal command; using it with a familiar ‘tú’ audience sounds overly stiff.
Confirma quién la firmó.
‘Lo’ refers to a masculine singular object; if the thing signed is feminine, use ‘la’ (e.g., ‘la firma’).
Confirma quién lo firma.
The verb should be in the preterite to indicate a completed action: ‘firmó’, not present ‘firma’.
↔Alternatives
Verifica quién lo firmó.
Verify who signed it.
Averigua quién lo firmó.
Find out who signed it.
Indica quién lo firmó.
Indicate who signed it.
Cultural Tip
In formal situations (e.g., speaking to a client or a superior) you would use the formal command ‘confirme’ instead of ‘confirma’. Also, remember that the accent on ‘quién’ is mandatory; omitting it is a common error in informal digital communication.