Quick answer
"Dime tu" is a phrase which is often translated as "tell me your", and "no sé" is a phrase which is often translated as "I don't know". Learn more about the difference between "dime tu" and "no sé" below.
dime tu
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1.
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(second person singular)
a. tell me your
Dime tu número de teléfono, y te llamo en cuanto sepa algo.Tell me your phone number, and I'll call you the moment I hear anything.
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no sé(
noh
 
seh
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (general)
a. I don't know
No sé si quiero pizza o un sándwich.I don't know if I want pizza or a sandwich.
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