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被动语态是由助动词be+过去分词构成的。这里的be既要表示出与主语的人称和数一致，也要表示出时、体的形式。被动语态有几种特殊用法。 主动形式表示被动意义 1)常见的这类动词有：act，add up，clean，compare，count，cook，draw，fill，iron，keep，let，look，make up，milk，kill，open，photograph，prove，read，sell，smoke，spoil等。 The window wont open. The cow milks well. Damp wood will not fire. She doesnt photograph well. His judgment proved wrong. It turned out fine that day. How did his coat catch on a nail? 2)实用动词need/want/deserve/require +V-ing形式表示被动意义。 My hair needs cutting。. The bike wants repairing. There is nothing to worry about. ②不定式修饰want, have等动词的宾语，而句中的主语同时又不是不定式的逻辑主语时： I want some clothes to wash. Do you have anything to say for yourself? ③不定式修饰buy，get，give等动词的直接宾语，而句中的间接宾语又是不定式的逻辑主语时： His sister gave him a bike to ride. | 
