作业帮是预习题，但没看懂，希望给予完整的答案，谢谢！
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/10/01 23:01:11
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解题思路： 如下
解题过程：
Trees are planted by students in March every year. The little girl was saved by a policeman. Many tall buildings were built last year. Our classroom is cleaned after school every day.
归纳结构：
一般现在时的被动语态：am, is, are + 过去分词
一般过去时的被动语态：was, were + 过去分词
最终答案：略
解题过程：
Trees are planted by students in March every year. The little girl was saved by a policeman. Many tall buildings were built last year. Our classroom is cleaned after school every day.
归纳结构：
一般现在时的被动语态：am, is, are + 过去分词
一般过去时的被动语态：was, were + 过去分词
最终答案：略