一、被动语态的时态及结构(以动词do为例) 结构:主语 + be + 过去分词 时态:1. 一般现在时: am (is, are) done. 2.带情态动词的被动语态:must (can, may, should, need, would) be done 3. 一般过去时: was (were) done * 4. 一般将来时: will (shall) be done * 5. 现...