Do I use ser or estar?

mo

if i say "she is a great friend" in spanish, would i use the verb ser or estar? and why?

"Ella es una buena amiga" or "Ella esta una buena amiga."

vanessa

she is a great friend in spanish would be " ella es una buena amiga"...... " ella esta una buena amiga" is incorrect..and why?? because in spanish there are differences between " ser or estar"..

anonymous

its "ella es una buena amiga"

mary-sue

Ella es. Estar is only used for temporary things, such as "Ella esta en el cine" (she is at the movies)