主动形式表示被动意义：

　　1)wash, clean, cook, iron, look, cut, sell, read, wear, feel, draw, write, sell, drive…

　　The book sells well.　　这本书销路好。

　　This knife cuts easily.　 这刀子很好用。

　　2)blame, let(出租), remain, keep, rent, build

　　I was to blame for the accident.

　　Much work remains.

　　3) 在need, require, want, worth (形容词), deserve后的动名词必须用主动形式。

　　The door needs repairing.= The door needs to be repaired.

　　This room needs cleaning. 这房间应该打扫一下。

　　This book is worth reading.　这本书值得一读。

　　4) 特殊结构：make sb. heard / understood (使别人能听见/理解自己)，have sth. done ( 要某人做某事)。