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"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.
my life(
may
 
layf
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. mi vida
The birth of my daughter was the best moment in my life.El nacimiento de mi hija fue el mejor momento de mi vida.
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don't know(
dont
 
no
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
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.
e. sepa
Regionalism used in Mexico
(Mexico)
What time will Denice get here? - Don't know. No one told me anything.¿A qué hora llegará Denice? - Sepa. Nadie me dijo nada.
f. sabe
Regionalism used in Mexico
(Mexico)
Did Mike like the gift? - Don't know. You should ask him.¿Le gustó el regalo a Mike? - Sabe. Deberías preguntarle.
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