前 + Title/Role
前 (qián) means 'former,' 'previous,' or 'ex-' when placed before a title or role. It indicates that someone previously held a position but no longer does.
前总统出席了今天的纪念活动。
qián zǒngtǒng chūxíle jīntiān de jìniàn huódòng.
The former president attended today's memorial event.
这位前同事现在自己开了一家公司。
zhè wèi qián tóngshì xiànzài zìjǐ kāile yī jiā gōngsī.
This former colleague has now started his own company.
前校长在任期间做了很多改革。
qián xiàozhǎng zài rènqī qījiān zuòle hěnduō gǎigé.
The former principal carried out many reforms during his tenure.