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"Es" is a form of "ser", a copular verb which is often translated as "to be". "Flaco" is an adjective which is often translated as "thin". Learn more about the difference between "flaco" and "es" below.
flaco(
flah
-
koh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (slim)
2. (poor)
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Hizo un flaco servicio a su familia comprando esas tierras.He did a disservice to his family by buying that land.
Esta mala noticia hace un flaco favor a la Bolsa.This bad news does the Stock Market no favors.
3. (literary) (weak)
A word or phrase restricted in usage to literature or established writing (e.g., sex, once upon a time).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
4. (defect)
a. weakness
La escritora dice que la pereza es su flaco.The write says that laziness is her weakness.
b. weak point
El jefe cree que él es perfecto y no tiene ningún flaco.The boss thinks he's perfect and doesn't have any weak points.
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
a. guy (colloquial) (masculine)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
A word or phrase that is masculine (e.g., el libro).
¿Tu hija sale con un flaco? - Sí, bueno, es que tiene ya 18 años.Is your daughter dating a guy? - Yes, well, she's 18 now.
b. boy (masculine)
A word or phrase that is masculine (e.g., el libro).
Me gusta mucho ese flaco. ¿Lo conoces?I really like that boy. Do you know him?
c. girl (feminine)
A word or phrase that is feminine (e.g., la manzana).
¿Quién es la flaca que está con Juan? Nunca la había visto.Who's the girl with Juan? I've never seen her before.
d. kid (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Qué flacos tan simpáticos! ¿Están en tu clase?What nice kids! Are they in your class?
ser(
sehr
)A copular verb links the subject of a clause to the predicate (e.g., My brother is tall).
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
a. to be made of
El casillero antiguo de mi abuela es de roble.My grandma's antique dresser is made of oak.
a. to root for
Yo soy del mejor equipo del mundo: FC Barcelona.I root for the best team in the world: FC Barcelona.
An impersonal verb is a verb with no apparent subject (e.g., Llueve en España.).
a. to be
Son las siete de la mañana.It is seven in the morning.
Era de noche cuando llegaron.It was night when they arrived.
An auxiliary verb, or helper verb, is a conjugated verb that comes before a main verb and determines the main verb's tense, mood, or aspect (e.g., I have gone.).
a. to be
El edificio fue diseñado por un equipo de arquitectos.The building was built by a team of architects.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
