am/is/are 的过去分词
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am/is/are的过去分词am/is/are的过去分词am/is/are的过去分词am/is/are的过去分词均是beenis,am-Was.Are-werewaswaswere
am/is/are 的过去分词
am/is/are 的过去分词
am/is/are 的过去分词
am/is/are 的过去分词均是been
is,am-Was .
Are-were
was was were