已被 is a compound auxiliary phrase used to form the passive voice in Chinese, indicating that an action has already been completed and affects the subject. It combines 已 (yǐ), meaning 'already', and 被 (bèi), the standard passive marker equivalent to 'be' or 'get' in English passive constructions. Together, they convey 'has already been' — emphasizing both the passive relationship and the completion of the action prior to the present moment.

This phrase typically appears before a verb and after the subject, as in: Subject + 已被 + Verb (+ Object/Result). It’s common in formal, written, or news-oriented contexts — especially when reporting completed events with consequences (e.g., injuries, diagnoses, approvals, or system updates). Unlike simple 被, 已被 adds temporal precision, making it useful for describing confirmed, irreversible states such as medical outcomes or official decisions.