

今日は早く寝るつもりです。
明日早いから、もう寝る?
寝る前に、歯をみがきます。
"ねる(寝る)" is in the lesson "Verbs 3" (Level 5), along with 15 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.