

あの男の人はだれですか。
公園に男の子が二人います。
このクラスは男が多いです。
"おとこ(男)" is in the lesson "Status" (Level 35), 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.