BBC news 2010-03-12 加文本

Seldom倒装

在有些情况下，句子中的谓语处于主语之前，这种情况被称作主谓倒装。倒装分为全部倒装和部分倒装两种。在全部倒装的句子里，整个谓语都放在主语之前，如：in come a beautiful girl。部分倒装句则只是谓语中的一部分放在主语前面，其他的则仍放在主语之后。下面几点讲的是不需要倒装的情况：

　　l)感叹句中的主谓不需要倒装，仅将what或者how在句子中构成的宾语、表语或者状语部分提到前面。如：What a cute dog!

　　2)当引导从句的疑问词和关联词位于从句的开头时，句子中的主谓不需要倒装。如：This is the book which I spoke of。

　　在倒装结构中，当一些具有否定意义的词放在句首时句子为部分倒装，这些词有not until,little,hardly,never,rarely,scarcely,only,seldom等，短语有in no way。at no time,in no case,at no point,hardly/rarely/scarcely…，when…no sooner…than…等，如：Little did she have that experience before，在句子中部分倒装，仅将助动词did提前就可以了。

2.He said it had been difficult for security forces to reach the affected villages because it was dark and roads were bad.

it's adj. for sb to do的结构。

而It is +adj.+for sb.+to do sth表示做某事对某人来说很adj.
这里的adj.是do sth.的属性
里面的sb.跟adj.没有直接联系
如It‘s difficult for you to deal with the problem.

3.Independent groups that monitor the issue say the number of those killed in racially motivated attacks last year dropped by more than a quarter to just over 70.

这句话的主语和谓语是Independent groups say。that monitor the issue是定语从句，修饰groups。后面是宾语从句。宾语从句的主体结构是：those killed dropped by more than a quarter……in racially motivated attacks是状语。