Former can be used in the following ways: former 有以下用法
as an adjective (only before a noun): 用作形容词(仅用于名词前):She still visits her former husband. 她仍去看望她的前夫。
as a pronoun (after ‘the'): 用作代词(用于the 后):Given the choice between rose pink and olive green, I'd choose the former every time. 如果在玫瑰红和橄榄绿之间选择,我每次都会选择前者。
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used for describing someone or something that had a particular job, title, status etc in the past, but not now 前任的;曾经的
The ceremony honoured all the former presidents who are still living. 这次庆典向所有仍然健在的前总统表示敬意。
the former Soviet Union 前苏联
He abandoned his former career as a geologist. 他放弃了曾经作为地质学家的事业。