主语+be being done。
例如：The shoes are being washed.
定义：表示此时此刻某事正在被做.例如：The sport meeting is being held in our school.我校正在举行运动会.Another bridge is being built over the Yangtze River.长江上正在修建另一座大桥.
构成：be + being+过去分词
A number of Dongfeng trucks are being shipped abroad.一批东风卡车正被运往国外.
用法：1)“be being done” 中的动词be应随主语作相应的变化。2)将现在进行时的主动语态变为现在进行时的被动语态的关键是：把be doing变为be being done.
例The students are cleaning the classroom now.→The classroom is being cleaned now.现在学生们正在打扫教室.(are cleaning变为is being cleaned)
例The boy is counting some eggs.→Some eggs are being counted.那男孩正在数鸡蛋.(is counting 变为 are being counted)
标签： #. #主语 #进行时 #are cleaning #教室
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