

O cavaleiro lutou contra um dragão.
O meu filho tem medo do dragão.
Este dragão deita fogo pela boca.
"o dragão" is in the lesson "Stories" (Level 33), along with 14 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.