vs
QUICK ANSWER
"To" is a preposition which is often translated as "a", and "keen on" is a phrase which is often translated as "interesado en". Learn more about the difference between "to" and "keen on" below.
to(
tu
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
2. (as far as)
a. hasta
I would run to your house right now just to see you!¡Correría hasta tu casa ahora mismo solo para verte!
a. por
The birth ratio is 107 boys to 100 girls.La proporción de nacimientos es de 107 niños por 100 niñas.
9. (in toasts)
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
I learned to drive when I was 17.Aprendí a manejar a los 17 años.
We need to work faster.Tenemos que trabajar más rápido.
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
I didn't want to tell you but I felt I had to.No quería decírtelo pero me vi obligada a hacerlo.
It's my party and I'll cry if I want to.Es mi fiesta y lloraré si quiero.
keen on(
kin
an
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. interesado en
The governor is not too keen on repealing the health care legislation.El gobernador no está demasiado interesado en derogar la legislación de atención médica.
b. entusiasmado con
Our new priest surprised everyone when he told us he was keen on the idea of women clergy.Nuestro nuevo sacerdote sorprendió a todos cuando nos dijo que estaba entusiasmado con la idea del clero femenino.