HELPFUL
Meaning of HELPFUL in English
adj.
1) ~ in; to (she's been very ~ to us)
2) ~ to + inf. (it's always ~ to be well-informed)
The Bbi combinatory dictionary of English, a guide to word combinations.
Комбинаторный словарь английского языка Bbi. Руководство по словосочетаниям.
2012