There are a plethora of synonyms for the phrase "be required" that one can use to add variety to their writing. Some of the commonly used ones include "must have," "need," "necessitate," "demand," "call for," "obligate," "requirement," and "mandatory." These synonyms can be used in various contexts like business, academic writing, or everyday speech to make the conversation more engaging and nuanced. Using such synonyms can help to convey the meaning more precisely and add value to the conversation by providing more comprehensive vocabulary. Therefore, it's always best to have a broad range of synonyms for "be required" in your writing and conversations.