Question

is和am的过去式和过去分词

Answer 1

am,is的过去式是was；is和am的过去分词been.
been：v.曾经到过(某地)；

扩展资料

　　We had to work within the parameters that had already been established.

　　我们必须在已设定的范围内工作。

　　No new SARS cases have been reported in the region.

　　该区没有新增非典型肺炎病例。

　　The information has been placed in the public domain.

　　这资料不受版权保护。