部分结构用主动形式表示被动含义，还有 get + 过去分词等特殊被动。
要点讲解
- 主动表被动一：need/want/require + doing = need + to be done：The flowers need watering. 花需要浇水了。
- 主动表被动二：主语 + be worth doing：The book is worth reading. 这本书值得读。
- 主动表被动三：感官动词 + 宾语 + do 表被动含义：The silk feels soft. 丝绸摸起来柔软。
- get + 过去分词（口语化被动）：He got hurt in the accident. 他在事故中受伤了。
- have sth. done 让某事被做：I had my hair cut. 我理了发。
- be made of（看得出材料）/ be made from（看不出材料）/ be made in（产地）：The desk is made of wood. 桌子是木头做的。
- 被动语态中时态不变，只变 be：is done, was done, will be done, has been done。
经典例句
- The problem is well worth discussing.
这个问题很值得讨论。 - She had her bike repaired yesterday.
她昨天请人修了自行车。 - My watch was lost on the way home.
我的手表在回家路上丢了。
易错提醒
- worth 后接 doing 表示"值得被做"，是主动形式表被动含义的经典考点。