求懂英语的解释一下这些分别是什么时态1.{isbe {am + p.p(过去分词){are2.be {was +p.p{were3.have/has been + p.p4.will be + p.pbe going to be + p.p5.must/may/need/can/should/ + be + p.p6.{isbe {am + being + p.p{are

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