Collocations for useful - adj.

be, look, prove, seem
become
make yourself
She told Fred to make himself useful.

consider sth, find sth
some leaflets which you might find useful

extremely, fairly, very, etc.
enormously, especially, exceptionally, highly, immensely, incredibly, more than (informal), particularly, terribly, tremendously
She has made an exceptionally useful contribution to the debate.

genuinely, truly
It needs to give more information to be truly useful.

increasingly
equally
The same information is equally useful when negotiating.

generally, universally
This method has proved the most generally useful.

potentially
practically
The subject is practically useful and will stand you in good stead when looking for a job.

certainly, undoubtedly
an undoubtedly useful skill

economically, politically, socially
to provide rewarding and socially useful employment

as
It was useful as a short-term measure.

for
This tool is useful for a variety of purposes.
Internet booking is useful for people who want a short break.

in
She was very useful in dealing with foreign visitors.

to
information which will be useful to new mothers

Useful is used with these nouns:
addition, address, advice, aid, ally, analogy, approach, asset, attribute, barometer, bibliography, book, checklist, clue, collection, comment, comparison, concept, contact, contribution, device, discussion, distinction, example, exercise, facility, feature, feedback, forum, framework, function, gadget, gauge, generalization, goal, guidance, guide, guideline, hint, improvement, index, indication, indicator, information, insight, instrument, introduction, knowledge, lesson, lever, link, material, means, measure, metaphor, overview, pointer, purpose, reference, refinement, reminder, resource, role, shorthand, sideline, site, skill, source, starting point, suggestion, summary, supplement, technique, tip, tool, trick, way, weapon, yardstick