

夏休みに朝顔を観察するつもりです。
子どもたちは虫を観察して、絵を描きました。
星を観察したことがありますか。
"かんさつする(観察する)" is in the lesson "Verbs 10" (Level 22), 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.