

先生、質問があります。
田中先生はやさしいです。
日本語の先生はどの人ですか。
"せんせい(先生)" is in the lesson "School" (Level 10), along with 13 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.