past participle       
noun [ C ] uk/ˌpɑːst pɑː ˈtɪs.ɪ.pəl/ us/ˌpæst ˈpɑːr.tɪ.sɪ.pəl/
 过去分词
the form of a verb, usually made by adding -ed, used in some grammatical structures such as the passive and the present perfect
  The past participle of "cook" is "cooked". cook 的过去分词是 cooked。 
 Synonym: perfect participle
Compare: gerund present participle
 - More examples
 - In English, the perfect is formed with 'have' and the past participle of the verb.
 - In Standard American, 'gotten' is used as a past participle of 'get'.
 - The past participle is used to form the passive.
 - Some adjectives are formed from past participles, like for example 'broken' in 'a broken leg'.
 - Some past participles are irregular, such as 'given', 'made' or 'seen'.