helpful

enormously, especially, extremely, immensely, most, particularly, really, unusually, very

Your detailed explanation was extremely helpful when I was trying to understand the problem.

not at all, not particularly

His advice was not particularly helpful when I needed practical solutions to my problem.

immediately

His advice wasn't immediately helpful, but I understood it better after a few weeks.

for

Learning a new language can be really helpful for finding better job opportunities.

in

Your feedback has been helpful in improving my writing skills.

on

Sarah's teacher was very helpful on the topic of essay writing for the exam.

to

A good dictionary can be helpful to anyone learning a new language.

friendly and helpful

The receptionist at the hotel was friendly and helpful when we arrived late at night.