

A tua missão é proteger a princesa.
Os guardas protegem a entrada do castelo.
Ninguém protegeu a base durante o ataque.
"proteger" is in the lesson "In game 1" (Level 31), along with 13 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.