Quick answer
"Certifico" is a form of "certificar", a transitive verb which is often translated as "to certify". "Doy fe" is a phrase which is often translated as "I testify to". Learn more about the difference between "doy fe" and "certifico" below.
doy fe(
doy
 
feh
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (I bear witness; often used with "de")
a. I testify to
Conozco a Bill desde hace años. Doy fe de su honradez.I've known Bill for a long time. I testify to his honesty.
b. I testify that
Doy fe de que a la hora del crimen Miguel Sorolla estaba conmigo en mi casa.I testify that Miguel Sorolla was with me at home at the time of the crime.
c. I vouch for
Azucena es una mujer inteligente y trabajadora. Fui su jefa y puedo dar fe de ello.Azucena is an intelligent and hard-working woman. I was her boss and I can vouch for that.
2. (legal; often used with "de")
a. I certify
En mi calidad de notario, por la presente doy fe de que todos los datos incluidos en este documento son ciertos.In my capacity as notary public, I hereby certify that all the information contained in this document is true.
3.
A word or phrase restricted in usage to literature or established writing (e.g. sex, once upon a time).
(literary)
(I credit)
a. I believe
No doy fe a rumores sin fundamento. Necesito hechos.I don't believe unfounded rumors. I need facts.
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certificar
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
1. (to validate)
a. to certify
Por la presente se certifica que la Sra. Lucía Monte completó el curso de Maestría en Geografía en nuestra universidad.This is to certify that Ms. Lucia Monte has completed her MA in Geography at our university.
2. (to send by registered mail)
a. to register
Conviene registrar los paquetes si estás enviando algo valioso.It's a good idea to register parcels if you're sending something valuable.
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