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"But" is a conjunction which is often translated as "pero", and "not only" is a phrase which is often translated as "no solo". Learn more about the difference between "but" and "not only" below.
but(
buht
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
conjunction
a. pero
I want to go, but it's really far.Quiero ir pero es muy lejos.
b. sino
He wasn't from New York, but from New Jersey.No era de Nueva York, sino de Nueva Jersey.
a. pero
But it is still too early to go to bed!¡Pero si aún es muy temprano para acostarse!
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. no ser más que
She is but a poor philosopher.No es más que una pobre filósofa.
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
preposition
a. salvo
I have read all his books but the last one.He leído todos sus libros salvo el último.
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
noun
a. pero
I don't want any buts or excuses.No quiero ni peros ni excusas.
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not only(
nat
 
on
-
li
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. no solo
Not only did she fail the exam, but she was absent the whole semester.No solo reprobó el examen, sino que estuvo ausente todo el semestre.
b. no solamente
This machine not only will reduce your costs, but it will improve the quality of your product.Esta máquina no solamente reducirá sus costos, sino que mejorará la calidad de su producto.
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