

Esta cadeira está livre?
Senta-te na tua cadeira, por favor.
Falta uma cadeira nesta sala.
"a cadeira" is in the lesson "Classroom" (Level 9), along with 10 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.