Can anyone explain why sometimes we need to use the def articles "o, a, os, as" with possessives, and sometimes not? is there any patterns or rules for that?
You may find it useful: http://duolingo.com/#/comment/64947
Eu uso os atalhos de português, e falo português ! hahaha :)
I wrote down "I improve my vocabulary". I would think this is correct too, no?