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"Se" is a form of "se", a pronoun which is often translated as "themselves". "Lo sé" is a phrase which is often translated as "I know". Learn more about the difference between "lo sé" and "se" below.
lo sé(
loh
 
seh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I know
¡Esta noche conoceremos a la novia de Jessica! - Lo sé.We're meeting Jessica's girlfriend tonight! - I know.
a. I know it
No sé cómo lo sé pero me lo habrá dicho alguien.I'm not sure how I know it but someone must have told me.
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se(
seh
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. themselves (plural)
Se compraron un coche nuevo.They bought themselves a new car.
b. itself (singular, neuter)
A mi gato le gusta lamerse.My cat loves licking itself.
c. himself (singular, masculine)
Se está afeitando.He is shaving himself.
d. herself (singular, feminine)
Ya se viste ella sola.She can already dress herself.
a. each other
Se miraron y sonrieron.They looked at each other and smiled.
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Se dice que ganó su fortuna jugando al póquer.People say he won his fortune playing poker.
Se habla español.Spanish is spoken here.
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