2019学年度人教版选修七Unit3Under the seaPeriod4Grammar-the passive voices学案设计

【语境展示】观察下面各句中动词-ing形式的被动式的结构及用法，然后加以总结。

1. Being attacked by a shark is a terrifying experience.

2. Who can prevent their plan from being carried out?

3. I saw him being carried away in an ambulance.

4. It seemed that Rose was not interested in the question being discussed.

5. Having been invited to the party, I felt greatly honoured.

【自我归纳】

★动词-ing形式的被动式的构成形式：

①一般式：being done，表示一个正在进行或与谓语所表示的动作同时发生的被动动作（句1-句4）；

②完成式：________，表示的被动动作发生在谓语所表示的动作之前（句5）。

★动词-ing形式的被动式在句子中可以作主语（谓语动词用单数）（句1）、宾语（句2）、宾语补足语（句3）、定语（句4）和状语（句5）等。

【拓展】

1. need, want, require表示"需要"时，后接动词-ing形式的主动形式表示被动意义。如：

The house needs / wants / requires painting. = The house needs / wants / requires to be painted.

2. be worth后接动词-ing形式的主动形式表示被动意义。如：

　A lot of the small towns in the area are definitely worth visiting.

3. 不定式的被动式、动词-ing形式的被动式和过去分词都可作定语表示被动意义，但所表示的动作发生的时间有所不同。如：

The problem to be discussed tomorrow is of great importance. （to be discussed所表示的被动动作将要发生）