vs 

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"Profesora" is a form of "profesor", a noun which is often translated as "teacher". "Buenas tardes, compañeros" is a phrase which is often translated as "good afternoon, comrades". Learn more about the difference between "profesora" and "buenas tardes, compañeros" below.
el profesor, la profesora(
proh
-
feh
-
sohr
)
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).
masculine or feminine noun
a. teacher
La Sra. Romero es mi profesora favorita.Mrs. Romero is my favorite teacher.
b. instructor
Contrató a una profesora de esquí para mejorar sus habilidades.He hired a ski instructor to improve his abilities.
c. professor (university)
Regionalism used in the United States
(United States)
Los profesores de mi universidad son los mejores.The professors at my university are the best.
d. lecturer (university)
Regionalism used in the United Kingdom
(United Kingdom)
El profesor de mi clase de italiano es muy difícil de entender.The lecturer in my Italian class is very difficult to understand.
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buenas tardes, compañeros(
bweh
-
nahs
 
tahr
-
dehs
 
kohm
-
pah
-
nyeh
-
rohs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. good afternoon, comrades (until sunset)
Buenas tardes, compañeros. Estamos aquí reunidos en asamblea para decidir si vamos a la huelga.Good afternoon, comrades. We're holding this meeting to decide whether we should go on strike.
b. good evening, comrades (later in the day)
Buenas tardes, compañeros. Bienvenidos a la asamblea general del sindicato.Good evening, comrades. Welcome to the union's general meeting.
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