useful

役立つ、便利な

何かをする助けになったり、必要なものを得られたりすること。

やさしい英語で： Helping you do something or giving you something you need.

• This map is useful.
• She gave me some useful advice.
• Would this tool be useful for fixing the chair?

使い方： useful for something/doing something (This bag is useful for carrying books.); useful to someone (The notes were useful to everyone.); useful to do something (It is useful to keep a spare key.)

類義語： helpful, handy, practical

反対語： useless

よく使う表現： useful information, useful for something, useful to someone, useful advice