QUICK ANSWER
"Cuán" is a form of "cuán", an adverb which is often translated as "how". "De" is a form of "de", a preposition which is often translated as "from". Learn more about the difference between "cuán" and "de" below.
cuán(
kwahn
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
1. (formal) (to what degree)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
a. how
¿Cuán profunda puede ser el agua cerca de esas rocas?How deep might the water be around those rocks?
a. how
Es fácil hablar, pero cuán difícil es poner en práctica los principios.It's easy to talk, but how difficult it is to put principles into practice.
de(
deh
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Te recojo en el coche de mi padre.I'll come get you in my father's car.
¿Esa no es la casa de Susana?Isn't that Susana's house?
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Voy a comprar otro traje de baño para el verano.I'm going to buy another bathing suit for the summer.
Se usa la palanca de cambios para cambiar las marchas.You use the gear shift to change the gears.
a. with
Me sorprendí llorando de pena al pensar en él.I caught myself crying with sorrow when I thought of him.
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
