⑥the +形容词主谓一致
The rich are not always happier than the poor.
The rich 表示一类人，应该用复数
⑦、倒装句的主谓一致
改错题倒装句的主谓一致一般考两种情况：
a. there be 句型
there be+名词+名词，那么最近的名词决定其形式
b. between/ among 放在句首+be+名词，名词其实是主语，所以be和名词保持一致
例：There are no known society in which left-handed people predominate.
A B C D
分析：there be 句型由最近的名词决定其形式，society当然用单数，A错，there are 改为there is
例：Between the foothills of the Andes and the Pacific
A B
Ocean are a dry coastal strip averaging about 30
C
miles in width.
D
分析：倒装句，are改为is
例：Among the favorite attractions at the National Air and
A B C
Space Museum in Washington D.C. are the film
D
presented on the five-story-tall screen.
分析：D错，应改为films , 主语实际上是名词，应该与谓语动词保持一致。
⑧、百分比结构的主谓一致
fifty percent of + 名词
one percent of + 名词
谓语动词的形式和百分比多少没有关系，主要取决于后面的名词，比如：
one percent of my students + are
fifty percent of my time is spent on working.
这里要强调两个结构
half of =fifty percent
most of + 可数名词 + are
most of + 不可数名词+ is
例：Nearly half of the ancient meteor craters has been
A B C
found in central and eastern Canada.
D
分析：C错，应改为have been。介词of的宾语为复数名词短语，作主语的中心词half当然表复数，相应的谓语动词应为复数形式。
例：Approximately fifty percent of the package utilized
A B
in the United States are for foods and beverages.
C D
分析：A错，应改为packages。从谓语动词用复数形式判断出主语是复数名词。注意food用复数表示不同种类的食品，beverage用复数表示不同种类的饮料，故（C）、（D）均没有错。