vs 

QUICK ANSWER
"Sí" is a form of "sí", an adverb which is often translated as "yes". "Lo conozco" is a phrase which is often translated as "I know him". Learn more about the difference between "sí" and "lo conozco" below.
(
see
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. yes
¿Quieres ir al cine? - Sí, pero primero hay que comer.Do you want to go to the movies? - Yes, but let's eat first.
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Yo sí quiero acompañarlos a Disney.I do want to go with you to Disney World.
Ella no aprobó, pero yo sí.She didn't pass, but I did.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. yes
¿Quieren ir mañana a la playa? -¡Sí!Do you want to go to the beach tomorrow? - Yes!
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. yes
El departamento dio el sí a la propuesta.The department said yes to the proposal.
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. himself (third person singular masculine)
Suele jugar ajedrez con sí mismo.He usually plays chess against himself.
b. herself (third person singular feminine)
¡Se envió una carta a sí misma!She sent a letter to herself!
c. itself (third person singular)
El hilo se está enredando en sí.The string is getting tangled up in itself.
d. themselves (third person plural)
Se mienten a sí mismos.They're lying to themselves.
e. yourself (second person singular formal)
Solo desea el bien para sí.You only wish good for yourself.
f. yourselves (second person plural formal)
¡Solo tienen que creer en sí mismos!You just have to believe in yourselves!
Copyright © 2025 Dictionary Media Group, Inc.
lo conozco(
loh
 
koh
-
nohs
-
koh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I know him
¿De qué conoces a Ramón? - Lo conozco de la escuela.Where do you know Ramon from? - I know him from school.
b. I know it
¿Conoces Uruguay? - Sí, lo conozco bien. He estado allí varias veces.Do you know Uruguay? - Yes, I know it well. I've been there several times.
c.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
A Juan lo conozco porque es amigo de mi hermano.I know Juan because he's a friend of my brother's.
Ese barrio lo conozco. Mis abuelos vivían allí.I know that neighborhood. My grandparents used to live there.
2.
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(second person singular)
a. I know you
Tengo la sensación de que lo conozco de algo. ¿Hemos coincidido antes en otra conferencia?I have the feeling I know you from somewhere. Have we met before in another conference?
Copyright © 2025 Dictionary Media Group, Inc.