

宿題を忘れた言い訳はもう聞きたくないです。
遅刻の言い訳を考えるより、早く起きたほうがいいよ。
先生にどんな言い訳をしたの?
"いいわけ(言い訳)" is in the lesson "Lesson" (Level 37), 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.