vs
QUICK ANSWER
"No sea" is a form of "ser", a copular verb which is often translated as "to be". "Que sea" is a phrase which is often translated as "he is". Learn more about the difference between "no sea" and "que sea" below.
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).
que sea(
keh
seh
-
ah
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. he is (masculine)
Por muy bueno que sea, Arturo no me parece la pareja adecuada para Miranda.However nice he is, I don't think Arturo is the right partner for Miranda.
b. she is (feminine)
Por muy guapa que sea, a mí Fernanda no me acaba de gustar.However beautiful she is, I don't particularly like Fernanda.
d. it is
Por muy eficaz que sea, jamás pagaría ese precio.However efficient it is, I'd never pay that price.
e. that is (used to refer to a thing)
Busco una casa que sea grande y luminosa.I'm looking for a house that is big and bright.
a. I am
Por tonta que sea, soy consciente de cómo me tratan.However stupid I am, I'm aware of how they treat me.
3. (formal) (subjunctive; second person singular)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
a. you are
Por lo rico que sea, jamás me casaría con usted.However rich you are, I would never marry you.
