vs 

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"Sé" is a phrase which is often translated as "I know", and "lo sé" is a phrase which is also often translated as "I know". Learn more about the difference between "sé" and "lo sé" below.
(
seh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I know
Sé que eres tímido y que no te gusta hablar en público.I know that you're shy and you don't like speaking in public.
a. I can
Yo traduciré el texto. Sé hablar alemán.I'll translate the text. I can speak German.
b. I know how
Sé tocar el violín, pero no soy un músico profesional.I know how to play the violin, but I'm not a professional musician.
3.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(imperative; second person singular; have existence)
a. be
Sé lo que quieras ser.Be whatever you want to be.
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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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