2） These young people know little about how to choose good books to read.
这些年轻人几乎不知道如何挑选优秀的书籍来读。

III. 不含否定意义的否定结构有些词和词组形式上是否定结构，但其含义是肯定的，比如：cannot but, can＇t help, no sooner...than, not...until, in no time, none other than, nothing but,等等。例句：
1） We can＇t but face the reality. 我们只有面对现实。
2） These old buildings will be replaced by modern apartment buildings in no time.
这些旧建筑将很快为现代化的公寓所代替。
IN. 否定结构的倒装语序. 我们有时为了强调而把否定词和词组放在句首，这时句子结构应倒装。例如：
1） On no account should we follow blindly.我们决不应当盲从。
2） No where has the world ever seen such great enthusiasm for learning as in our country.没有任何其他地方有我国这样高的学习热情。

五、 含有it的结构
考生病句：
1. As is known to all of us that science and technology play an important role in the development of society.
2. It is known to us, practice makes perfect.
正确表达：
1. It is known to all of us that science and technology play an important role in the development of society. (或:As is known to all of us, science...)
2. It is known to us that practice makes perfect. (或:As is known to us, practice...)
评议与分析：
很显然，两个考生混淆了it和as的用法。如果用it作形式主语，后面的主语从句必须由that引起；如果用as，则后面不能用that，因为as是关系代词，代表practice makes perfect。It 在英语中是个相当活跃的代词，在写作中我们常要使用它。以下几种用法应熟练掌握，并能灵活运用。
1．作形式主语
It is necessary for us to master a foreign language skillfully. It makes difference whether we could purify the air or not.
2.作形式宾语
We find it rather difficult to prevent people from doing that. Modern science has made it possible for babies to grow healthily and for people to live longer.
3.引导强调句
It is only by this way that we can achieve success. It was then that people began to realize the importance of controlling population.