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QUICK ANSWER
"Don't know" is a form of "don't know", a phrase which is often translated as "no sé". "My life" is a phrase which is often translated as "mi vida". Learn more about the difference between "my life" and "don't know" below.
don't know(
dont
no
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. no sé
What's the score? - Don't know, don't care.¿Cuál es el resultado del partido? - No sé y no me importa.
b. ni idea
Do you think Mayra will win the election? - Don't know. I hope so.¿Crees que gane la elección Mayra? - Ni idea. Espero que sí.
c. sabe Dios
Do you think Amanda will like the meal I prepared? - Don't know. I've never met Amanda.¿Crees que a Amanda le guste la comida que preparé? - Sabe Dios. Nunca he conocido a Amanda.
d. a saber
How many tickets did you sell? - Don't know. I didn't keep track.¿Cuántas entradas vendiste? - A saber. No llevé ningún registro.