

白い靴下を三足買いました。
靴下に穴があいていますよ。
寒いから、靴下をはいて寝る。
"くつした(靴下)" is in the lesson "Footwear" (Level 5), along with 8 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.