①The G8 is made up of political leaders from France, the United States, Britain, Germany, Japan, Italy, Canada and Russia.
②The Group of Eight, or G8, was formed by eight of the world’s wealthiest nations in 1998.
③... the topic of Africa will be discussed in detail.
④... he was delighted that the 2012 Olympic Games would be held in London ...
⑤The news is being celebrated by crowds in the streets.
⑥At 12：45 UK time today, the name of the host city for the 2012 Olympic Games was being announced by the International Olympics Committee (IOC) in Singapore.
⑦Reforms have been demanded by people from all over the world.
⑧Applications to host the games had also been made by Moscow, Madrid, New York and Paris.
⑨They want the leaders to cancel the debt of Africa’s poorest countries so that the problems there can be prevented from getting any worse.
[我的发现]
(1)及物动词的被动语态的多种时态形式，即“be＋v.过去分词”中，通过对be动词的变化体现出时态意义。
(2)句①～句⑧分别使用了一般现在时、一般过去时、一般将来时、过去将来时、现在进行时、过去进行时、现在完成时和过去完成时的被动语态。
(3)句⑨从句是含有情态动词的被动句。
