i Need some help with use these words in portugues . the rule explained by a native speaker pleease .....
The preposition EM (in - english) has to be declined according to the gender and number!
So whenever you have to use the preposition EM, you need to check the next word and its article. For instance " Os Estados Unidos ". You will say that you live in the US, you should say:
Eu moro nos Estados Unidos = em + os
Eu estou na escola = em + a
Em + a = na
Em + o = no
Em + as = nas
Em + os = nos