

O comboio vai passar por um túnel.
Não gosto de conduzir no túnel.
Este túnel é muito comprido.
"o túnel" is in the lesson "Infrastructure" (Level 14), along with 16 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.