语态的基本结构：
主语+be +过去分词(+by+动作的发出者）
① 一般现在时：am/is/are+过去分词
如：
Trees are planted every year.
② 现在进行时 am/is/are+ being +过去分词
如：
The road is being repaired.
③ 现在完成时 have/has + been +过去分词
如：
The work has been finished.
④ 一般过去时 was/were + 过去分词
如：
The story was told by him.
Many birds were killed last year.
⑤过去进行时 was/were+ being + 过去分词
如：
The new house was being painted when I got home.
⑥过去完成时 had +been+ 过去分词
如：
He told me that the work had been finished.
⑦一般将来时 will +be + 过去分词
如：
The problem will be discussed tomorrow.
⑧ 过去将来时 would/should +be +过去分词
如：
He said that the Christmas tree would be put up soon.
⑨情态动词的被动语态
情态动词+ be +过去分词
如：
The problem must be solved soon.
Children should be taught to love animals.
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