

病気の友だちに電話しました。
病気の人はいませんか。
病気の犬を病院に連れて行きました。
"びょうきの(病気の)" is in the lesson "Treatment" (Level 13), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,379 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.