una persona muy simpatica (accent on first a)
It means "you are a very friendly girl"
Maria es = Maria is Bonita= Pretty/Beautiful y = and Simpatico= Nice (it should be 'simpatica' - feminine)
"ella es una chica" means "she is a girl" in Spanish.
she/it is not very nice/likeable.
es una clase de matematicas means is a kind of mathematics
Phrase: Eres muy guapo. Yo creo que hay una simpática sonrisa. Creo que Ud. es un hombre increíble. Translation: You are very handsome. I think that there is a nice smile. I think that you are an incredible man.
It means "it is one" referring to a feminine noun, e.g. es una mujer = it's a woman.
"Una palabra nueva es" translates to "a new word is" in English.
you are a mean professor... but "es" would be "eres" instead.
"La maestra es una pendeja" translates to "The teacher is an idiot" in English.
"Las amigas son simpáticas."