

申し込みに写真は必要ですか。
明日、パスポートが必要です。
お金はあまり必要じゃないです。
"ひつよう(必要)" is in the lesson "Application" (Level 40), along with 12 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.