BBC news 2009-07-30 加文本

1.Latest reports from the town of Maiduguri where the militants are based say that fierce fighting is continuing with the militants still holding several areas of the town although it’s difficult to assess exactly what’s happening.

这句话的主干是Latest reports from the town of Maiduguri say……where the militants are based是定语从句，修饰Maiduguri。that fierce fighting is是宾语从句，说的具体内容。although引导让步状语从句。

2.The IMF says it will increase loans to low income nations over the next couple of years by 2 billion dollars more than what's called for by the Group of Twenty leading economies at their summit in April.

这句话的主干是The IMF says it will increase loans to low income nations。by 2 billion dollars more than是表示幅度。what's called for是what引导的宾语从句，做介词than的宾语。

3.It is imperative for the Iraqi authorities to release political prisoners, to treat them appropriately and humanely.

it is adj.+for sb to do sth和of sb to do sth的区别。

若形容词是描述不定式行为者的性格、品质的，如kind，good，nice，right，wrong，clever，careless，polite，foolish等，用of sb.。
 
 It’s very kind of you to help me. 你能帮我，真好。
 
 It’s clever of you to work out the maths problem.
 你真聪明，解出了这道数学题。
 

若形容词仅仅是描述事物，不是对不定式行为者的品格进行评价，用for sb.，这类形容词有difficult，easy，hard，important，dangerous，（im）possible等。
 
 It’s very dangerous for children to cross the busy street.
 对孩子们来说，穿过繁忙的街道很危险。
 
 It’s difficult for us to finish the work. 对我们来说，完成这项工作很困难。
 
注意：of sb. 的句型通常都可转换为不定式作状语的句子，但for sb. 句型不可以。
 
 It’s very nice of you to offer me a seat.
 
 = You are nice to offer me a seat. 十分感谢你给我让座。
 
 It is careless of him to lose so many things.
 
 = He is careless to lose so many things. 他丢了这么多东西，真是太粗心了。
 
 It’s very important for you to practise your oral English in daily life.
 在日常生活中练习你的英语口语非常重要的。
 
 这句话不能说成：It is very important of you to practise…