被动语态的基本结构：

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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