The phrase "be used useful" can be replaced with several synonyms that convey the same meaning. These include "be utilized beneficial," "be employed advantageous," "be applied helpful," "be exercised profitable," and "be put to good use." Whether in written or spoken language, using one of these synonyms for "be used useful" can add variety and depth to one's vocabulary while maintaining the intended message. Additionally, considering synonyms can aid in refining language and selecting the most precise and fitting word for a given context. In summary, there are many synonyms for "be used useful" that can enhance communication and express the desired meaning accurately.