helpful

US /ˈhelp.fəl/
UK /ˈhelp.fəl/
"helpful" picture
1.

役立つ, 助けになる

providing useful assistance or advice

:
The librarian was very helpful in finding the books I needed.
司書は私が探している本を見つけるのにとても役立ちました
It was very helpful of you to offer your assistance.
助けを申し出てくれてとても助かりました