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QUICK ANSWER
"Ah" is a form of "ah", an interjection which is often translated as "ah". "Ya entiendo" is a phrase which is often translated as "now I understand". Learn more about the difference between "ya entiendo" and "ah" below.
ya entiendo(
yah
 
ehn
-
tyehn
-
doh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. now I understand
Ya entiendo porque no quisieron acompañarnos.Now I understand why they didn't want to join us.
b. now I get
Ah, ya entiendo porque cambiaste de opinión en el último momento.Oh, now I get why you changed your mind at the last minute.
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ah(
ah
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. ah
¡Ah, qué lástima que no vengas!Ah, what a pity you're not coming!
b. oh
¡Ah! ¡Qué increíble sorpresa!Oh! What an incredible surprise!
c. aw
¡Ah! Creo que perdí mi reloj.Aw! I think I lost my watch.
2. (used to express interrogation)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
a. what
¿Ah? No entendí.What? I didn't get it.
b. eh
¿Ah? ¿Qué dijiste?Eh? What did you say?
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