Quick answer
"When" is an adverb which is often translated as "cuándo", and "as" is a preposition which is often translated as "como". Learn more about the difference between "when" and "as" below.
when(
wehn
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (in questions)
a. cuándo
When was the last time you cried?¿Cuándo fue la última vez que lloraste?
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
2. (relative)
a. cuando
I was sleeping when he got home.Estaba durmiendo cuando llegó a casa.
b. en que
That was the year when we bought our first apartment.Ese fue el año en que compramos nuestro primer apartamento.
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as(
ahz
)
A preposition is a word that indicates the relationship between a noun and another word (e.g. He ran through the door.).
1. (in the role of)
a. como
I spent 20 years working as an accountant.Trabajé como contador durante 20 años.
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
2. (when)
a. cuando
The phone rang as we were leaving the house.Sonó el teléfono cuando estábamos saliendo de la casa.
3. (while)
a. mientras
I like to listen to music as I work.Me gusta escuchar música mientras trabajo.
4. (at the same time as)
a. a medida que
I've really come to respect her as I've gotten to know her.Realmente llegué a respetarla a medida que la fui conociendo.
5. (because)
a. como
As our flight was canceled, we had to find a hotel for the night.Como se canceló nuestro vuelo, tuvimos que encontrar un hotel donde pasar la noche.
6. (like)
a. como
Please leave everything as you found it.Por favor, deja todo como lo encontraste.
7. (though)
a. aunque
Intelligent as you are, you still have to work hard.Aunque eres inteligente, todavía tienes que trabajar duro.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
8. (in comparisons)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
I am as thin as she is.Soy tan delgada como ella.
I do not have as many shoes as my sister.No tengo tantos zapatos como mi hermana.
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