"I don't know" is a phrase which is often translated as "no sé", and "as for me" is a phrase which is often translated as "respecto a mí". Learn more about the difference between "I don't know" and "as for me" below.
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as for me
A phrase is a group of words commonly used together (e.g once upon a time).
a. respecto a mí
My family is happy with our new home, but as for me, I'm feeling troubled.Mi familia está contenta con nuestra casa nueva, pero respecto a mí, me siento preocupado.
b. en cuanto a mí
Susan would like to dance all night. As for me, I'd rather go home.A Susan le gustaría bailar toda la noche. En cuanto a mí, prefiero ir a casa.
c. por mi parte
Ellen has a broken leg, and as for me, a broken arm.Ellen tiene una pierna rota, y en cuanto a mí, un brazo roto.