必要 用
必要用 Kanji
歯医者に行く必要はない。 You don't need to go to the dentist's.
用 Kanji
何の用でここに来たのですか。 What has brought you here?
それから服を着て、講義用のメモを手さげ鞄に詰め込み、階段を駆け下りた。 Then he got dressed, stuffed his lecture notes into his briefcase, and ran down the stairs.