一、 被动语态的用法： 1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词 Our classroom is cleaned everyday. 我们教室每天都被打扫。 I am asked to study hard. 我被告知要努力学习。 Knives are used for cutting things. 刀是用来切东西的。 2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词 A new shop was built last year. 去年修了一座新商店。 Dinosaur eggs were laid long long ago. 恐龙蛋被放置了很久很久。 3. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词 A new hospital will be built in our city. 我们城市将要修建一家新医院。 Many more trees will be planted next year. 明年会
