English and Portuguese for German exchange!

Herzlichen GLückwunsch How do we sing "Happy Birthday" (the song) in german?

let's drink coffee!

Articles in German. Is there any clue to memorize which article to use correctly (der, die, das, ein, eine....)?

Any whatsapp groups for learning german? I can exchange for portuguese as well. Gute Tag!

Der Tag ist wunderschön!!!

german language is beautiful die tag is wondershon! correct?!