Collocations for helpful - adj.

be, prove | consider sth, find sb/sth

enormously, especially, extremely, immensely, most, particularly, really, unusually, very
Thank you, you have been most helpful.

not at all, not particularly
Demanding peace short of victory would not be at all helpful.

fairly, quite | immediately
indulging in ambitious, but not immediately helpful plans

generally, usually | always, invariably

for
This information would be extremely helpful for teenagers.

in
Graphs are helpful in presenting the information.

on
He was quite helpful on how to do the accounts.

to
The lifts will be helpful to the older patients.

friendly and helpful
I found all the staff friendly and helpful.