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QUICK ANSWER
"Oh" is a form of "oh", an interjection which is often translated as "oh". "Eso es genial" is a phrase which is often translated as "that's great". Learn more about the difference between "eso es genial" and "oh" below.
eso es genial(
eh
-
soh
 
ehs
 
heh
-
nyahl
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. that's great
Aprobé todas las asignaturas. - Eso es genial.I passed all my subjects. - That's great.
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oh(
oh
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. oh
Se le ha caído la cartera. Aquí tiene. - ¡Oh, gracias!You dropped your wallet. Here you go. - Oh, thank you!
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