

Vou ao Porto na próxima semana.
A semana passou muito depressa.
Quantas vezes por semana vais ao ginásio?
"a semana" is in the lesson "Time 1" (Level 1), along with 9 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.