The phrase "have do" can be replaced by several synonyms that are useful in different contexts. For example, "perform" or "execute" can be used when referring to tasks or duties required of someone. "Accomplish" can be used when referring to completing a task or achieving an objective. "Experience" can be used when referring to past events or memorable moments. "Possess" can be used when referring to material possessions or skills. "Undergo" can be used when referring to a process or procedure. These synonyms can help add variety to writing and improve clarity by avoiding repetition of the same phrase.