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"Oh" is an interjection which is often translated as "oh", and "I'm so sorry" is a phrase which is often translated as "lo siento mucho". Learn more about the difference between "oh" and "I'm so sorry" below.
oh(
o
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. oh
Did you know there were going to be fireworks tonight? - Oh? No, I didn't.¿Sabías que iba a haber fuegos artificiales esta noche? - ¡Oh! No, no lo sabía.
b. vaya
Oh! What a pleasant surprise to see you here!¡Vaya! ¡Qué sorpresa tan agradable verte aquí!
c. ah
Oh! I get it now. The TV won't turn on because it's not plugged in!¡Ah! Ya entendí. ¡La tele no se enciende porque no está enchufada!
a. ay
Oh! That's hot.¡Ay! Eso está caliente.
a. eh
Oh, sir, you're stepping on my shoe!¡Eh, señor! Me está pisando.
a. en serio
Oh? You're going to be the master of ceremonies?¿En serio? ¿Vas a ser el maestro de ceremonias?
b. no me digas
Oh, you have got to be kidding. Steve's going out with Melanie again?¡No me digas! Debe ser una broma. ¿Steve está saliendo de nuevo con Melanie?
c. de veras
Oh? You won the gold medal?¿De veras? ¿Ganaste la medalla de oro?
a. ay
Oh! Shut up! That is disgusting!¡Ay! ¡Cállate! ¡Eso es asqueroso!
a. ah, sí
I'm leaving early today. - Oh?Hoy salgo temprano. - ¿Ah, sí?
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I'm so sorry(
aym
 
so
 
sa
-
ri
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. lo siento mucho
I'm going to be late. I'm so sorry.Voy a llegar tarde. Lo siento mucho.
b. lo lamento mucho
My husband left me. - I'm so sorry. Is there anything I can do?Mi esposo me abandonó. - Lo lamento mucho. ¿Hay algo que pueda hacer?
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