被动语态练习题带答案据一般现在、一般过去、一般将来的被动语态的例句
问题描述：
被动语态练习题带答案
据一般现在、一般过去、一般将来的被动语态的例句
答
一般现在 The classroom should be cleaned every day.
一般过去 Many trees were planted last year.
一般将来 We will be encouraged by the teacher.