

ご飯を食べた後に、歯をみがきます。
仕事の後に、ジムに行きます。
授業の後に、少し話せますか。
"あとに(後に)" is in the lesson "Time 2" (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.