How the word "porquê" is translated into English
Não vens à festa? Porquê?
Ele saiu cedo e não sei porquê.
Porquê tanta pressa hoje?
"porquê" is in the lesson "Adverbs 2" (Level 31), along with 11 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.
