UNIT 4 HISTORY AND TRADITIONS
B2U4 Grammar   (过去分词作定语、宾语补足语)
The Past Participle as the Attributive and object complement
begodohavemakeknowcome
动词的三种形式(现在式、过去式和过去分词)
was/werewentdidhadmadeknewcame
beengonedonehadmadeknowncome
the past participle
pasttense
roomform
a closed door
a broken window
a polluted river