1. 并列结构.这主要是指由and或or连接的几个并列成分在形式上必须保持一致.这一考点在历年六级改错中出现频率相当高,同学们要给予相当的重视.

　　（1） At the heart of the NEA survey is the belief in（改成that,同位语从句）our democratic system depends on leaders who can think critically, analyze texts and writing clearly.（07年1月新六级改错第6题）这里的writing显然与think和analyze并列,因此应该用同样的形式,所以应该改成write.

　　（2） Their experiments have shown that reading disorders are most likely the result of what is, in an effect（去掉an,固定介词搭配），faulty wiring in the brain——not lazy, stupidity or a poor home environment .（ 06年6月六级改错第4题）这里的lazy应该与stupidity和a poor home environment并列,因此该用名词形式laziness.

　　（3） Restrict yourself to one or two pages, and listing any publications or referees on a separate sheet.（06年1月六级改错第7题）通过and将restrict和listing联系起来表示并列关系,所以listing应该用原形list.

　　（4） How do you know how to act in a classroom,or a department store, or toward a person who smiles or laugh at you?（04年6月六级改错第9题）

　　这里的smiles和laugh肯定应该用同样的形式,而前面的a person又提示我们该使用第三人称单数,所以将laugh改成laughs.

　　（5）Most experts believe this can continue even as if（去掉as,这里的even if表示即使）the population doubles by the mid-21st century, although feeding 10 billion people will not be easy for politics,economic and environmental reasons.（04年1月六级改错第6题）同样,这里的politics应该改成political和economic, environmental并列。

　　（6）Elsewhere, rice experts in the Philippines are producing a plant with few stems and more seeds.

　　（04年1月六级改错第9题）few应该与more形成对应,所以应改成比较级形式fewer.