BBC news 2009-08-18 加文本

1.Prosecutors in the United States have charged a man with carrying out what they say is the largest ever case of hacking and identity theft.

参考翻译：美国检察官控诉一名男子实施了有史以来最大的黑客和窃取身份案件。

结构分析：这句话的主干是Prosecutors in the United States have charged a man……with carrying out是起诉的罪名。what they say is the largest ever case是what引导的宾语从句，做about的介词宾语。

2.They are alleged to have found a way around the security firewalls of the companies' computer networks, removing data relating to 130 million debit and credit cards.

参考翻译：据称他们发现了绕过公司电脑网络安全防火墙的方法，窃取了1.3亿份借记卡和贷记卡资料。

结构分析：这个句型相当于they are said to……可以转换为It is said that they……
removing data是现在分词做结果状语。

3.The Ethiopian runner Kenenisa Bekele has confirmed his position as the world's best middle distance runner winning his fourth consecutive World Championship gold in the 10,000 meters.

参考翻译：埃塞俄比亚田径选手Kenenisa Bekele连续夺得了第四枚10,000米世界锦标赛金牌，奠定了其世界最佳长跑运动员的地位。

结构分析：这句话的主干是The Ethiopian runner Kenenisa Bekele has confirmed his position……
winning his fourth consecutive World Championship gold是现在分词做原因状语。