被动语台的结构不是:形态动词+BE+过去分词 么?为什么这句话的被动语态不是这个结构:

被动语态 be+过去分词,如果有情态动词,才是 can may must..等+be+过去分词

be done

BE+过去分词就好

被动语态 be+过去分词,如果有情态动词,才是 can\may \must\should\will+be+过去分词
情态动词+ have +过去分词

1) may(might) have + done sth, can (could) have + done sth 表示过去，推测过去时间里可能发生的事情。
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.

2) must have +done sth，对过去时间里可能发生的事情的推测，语气较强，具有"肯定"，"谅必"的意思。
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.

3) ought to have done sth, should have done sth
本应该做某事，而事实上并没有做。否定句表示"不该做某事而做了"。
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.（事实上已扔了。）
ought to 在语气上比should 要强。

4) needn't have done sth 本没必要做某事
I dressed very warmly for the trip, but I needn't have