

将来、医者になるつもりです。
もうすぐ春になるね。
二十歳になる前に、日本へ行きたいです。
"になる" is in the lesson "Verbs 19" (Level 33), 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.