be done的'8种时态的被动语态：
1.一般现在时：am/is/are/+
2.一般过去时：was/were+
3.现在完成时:has/have+been+
4.过去完成时:had been+
5.现在进行时：am/is/are+being+
6.过去进行时:was/were+being+
7.一般将来时：will+be+
8.过去将来时:would be+含有情态动词的被动语态构成：情态动词+be+不定式的被动语态：to+be+
