第1个回答 2021-09-26
is，are，am都是属于be动词，它们的过去式是was
第2个回答 2021-07-12
is ,am的过去式是was,are 的过去式是were
第3个回答 2021-12-13
is am的过去式都是 was
are的过去式是 were
如
He was a student ten years ago.
十年前他是学生。
第4个回答 2021-12-04
过去式：is-was，are-were，am-was
过去分词：is are am-been
第5个回答 2021-07-12
is am 的过去式都是was
are 过去式为were.