There are many ways to express the idea of being helpful to someone. Some synonyms for "be helpful to" include "assist," "aid," "support," "guide," "facilitate," "enable," "encourage," "advise," "back," "serve," "contribute," and "lend a hand." Each of these words has a slightly different connotation and usage, but they all imply a willingness and desire to be of service to others. Using different synonyms for "be helpful to" can add variety and nuance to our language and communication, and can help us convey our intentions and actions more precisely and effectively.