passed / past are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
passed: (verb) go across or through. (verb) place into the hands or custody of. (verb) travel past. (verb) go unchallenged; be approved. (verb) go successfully through a test or a selection process. (verb) accept or judge as acceptable. (verb) allow to go without comment or censure. (verb) transfer to another; of rights or property. (verb) throw (a ball) to another player. (verb) cause to pass.
past: (noun) the time that has elapsed. (noun) a earlier period in someone's life (especially one that they have reason to keep secret). (noun) a verb tense that expresses actions or states in the past. (adjective) earlier than the present time; no longer current. (adjective) of a person who has held and relinquished a position or office.
passed: p·AE·s·t
past: p·AE·s·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)