必须有been 是为要体现 “被动”语态;后面如果没有其他动词的过去分词,就不知道是 被"怎么“了
被动语态的标准结构,就是 be 动词 + 动词过去分词,
现在完成时必须把 be (am, is, are) 改为 have/has been,
两者加起来,现在完成时被动语态就只能是 have/has been + 动词过去分词
例如: This mirror has been broken before.
这面镜子过去曾被打破过
不需要完成时体现的,用过去式就能表达了:
This mirror was broken yesterday.
追问在完成时的被动语态必须要用been吗
追答只要是完成时,就一定有 have / has / had 其中之一
只要是被动语态,就一定有 am / is / was / are / were / being / been 其中一个be 动词的形式
完成时的被动语态,就必须是 have been / has been / had been 其中一个,配上一个表达行为或动作的动词的过去分词。