"My apartment is big."
Translation:Mi apartamento es grande.
The previsious task i had a mistake: Tu apartamento es bonitA. I got a explanation tip, so apartamento is masculine and singular, and the correct answer is 'tu apartamento es bonitO'. Why changed the 'a' in bonitA to o, and why not changed in grandE to grandO? in other tasks I have also noticed that sometimes the ending of an adjective matches the noun and sometimes not. why?