Section Ⅲ 　Grammar--复习被动语态和by＋v.­ing形式

语 境 自 主 领 悟 先观察原句 ①Rice is also grown in many other Asian countries.

②Researchers were brought in from all over China to develop the new system.

③The research was supported by the government.

④In Pakistan rice will be grown in many parts of the country.

⑤The new hybrid rice has been developed by the Yuan Longping High­tech Agricultural Company of China.

⑥The shop closes at 6：00 pm every day.

⑦The apple tastes good.

⑧The new product by the company sells well.

⑨Open the door by winding the handle.

⑩People usually greet each other by shaking hands. 后自主感悟 1.①句采用了一般现在时的被动语态，其构成形式为：am/is/are＋done。

2.②③句采用了一般过去时的被动语态，其构成形式为：was/were＋done。

3.④⑤句分别用了一般将来时和现在完成时的被动语态。

4.⑥⑦⑧句中谓语动词以主动形式表示被动意义。

5.⑨⑩句中，by＋v.­ing形式表示通过......方式。

　　1．各种时态的被动语态的构成

　　被动语态表示主语为动作的承受者，只有及物动词才有被动语态，被动语态由"be＋及物动词的过去分词"构成。

　　(1)一般现在时被动语态的构成：am/is/are＋done

Before you leave the lab，make sure the electricity is turned off and the windows