

「手伝ってくれる?」「もちろん!」
もちろん、一緒に行きますよ。
日曜日はもちろん休みです。
"もちろん" is in the lesson "Adverbs 3" (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.