

あの女の子は私の妹です。
クラスに女の子は何人いますか。
友だちに女の子が生まれました。
"おんなのこ(女の子)" is in the lesson "Family 1" (Level 1), along with 12 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.