被动句1：主语+被/叫/让+宾语+动词+其他成分

subject (subject → the person or thing performing the action, here it is the target being acted upon) + 被/叫/让 + agent + verb + other elements (result, 了...). For example 手机被我用坏了 (the phone got used and broken by me) — after the verb 用 there must be a result complement 坏 (huài – broken) and 了.

when you want to say that something happened to the subject unintentionally, usually with an undesirable result (broken, dirtied, bewitched).

被 can be used in both written and spoken language and the agent can be omitted (被用坏了 – got used and broken); whereas 叫/让 lean colloquial and REQUIRE the agent to be stated after them (do not say 叫弄脏了 but 叫弟弟弄脏了).

forgetting to add an element after the verb — the 被 construction almost never ends with a bare verb; there must be 了/a result/a direction (wrong: 被我用 → correct: 被我用坏了).