The meeting being held now is very important.

　　现在正在召开的会议非常重要。

　　[点津]　动词­ing形式的一般被动式表示一个被动的动作正在进行；过去分词表示一个被动的动作已经完成；不定式的被动式表示将来的一个被动的动作。

　　The problem being discussed (＝ which is being discussed) at the meeting is very important.

　　会上正在讨论的问题非常重要。

　　The problem discussed (＝ which was discussed) at the meeting is very important.

　　会上讨论过的问题非常重要。

　　The problem to be discussed (＝ which will be discussed) at the meeting is very important.

　　会上将要讨论的问题非常重要。

　　5．作状语

　　Being asked to give a performance, she couldn't very well refuse.

　　有人请她表演一个节目，她不好拒绝。

　　Having been given such a good chance, how could you let it slip away?

　　人家给了你这样一个好机会，你怎能轻易放过？

　　　2

　　(重庆高考改编) Having_been_asked (ask) to work overtime that evening, I missed a wonderful film.

　　6．作表语

　　The South China is being flooded because of the continuous heavy rain.

　　由于持续的强降雨，华南正被洪水围困。

　　三、在动词­ing形式的被动式前加否定副词not便可构成其否定形式

　　He was unhappy for not having been invited to the party.

　　没有被邀请参加聚会，他感到很不高兴。

　　Not having made preparations, they failed.

　　因为没有准备，他们失败了。

　　四、使用注意事项

　　1．在want，need，require等动词后，常用动名词的主动形式表示被动含义。

　　The radio needs repairing.

　　＝ The radio needs to be repaired.

　　这台收音机需要修理了。

　　2．be worth后常跟动名词的主动形式表示被动含义。

　　The book is worth reading again.

　　＝ The book is worthy of being read again.

　　这本书值得再读一遍。

　　Ⅰ.用所给词的适当形式填空

　　1．It's fun being_taken (take) to the zoo.

2．I can't bear being_laughed_at (laugh at) by them.