现在进行时的被动语态

　　定义：现在进行时的被动语态表示此时此刻某事正在被做.

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　　例如：

　　The sports meeting is being held in our school.

　　我校正在举行运动会.

　　Another bridge is being built over the Changjiang River.

　　长江上正在修建另一座大桥.

　　构成：be being 过去分词

　　例如：

　　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(sing./ pl.)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1.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2.The boy is counting some eggs.

　　→Some eggs are being counted.

　　那男孩正在数蛋.(is counting 变为 are being counted)

　　你也可以给他们对比讲一下：现在完成时

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