

今日は空がきれいですね。
夜の空に星が見えます。
空が暗いから、傘を持っていこう。
"そら(空)" is in the lesson "Nature" (Level 21), along with 11 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.