2024年3月13日发(作者:)
a class of 谓语动词结构的用法
一、结构的含义和用法
a class of + 谓语动词是一种分析结构,用来表示一类事物具有某种特征或状态。这里的 a class of 是一个固定短
语,意思是“一类,一种”,后面接复数名词,表示某一类事物的总称。谓语动词则用来描述这一类事物的共同特
征或状态,可以是形容词,副词,动词不定式,动名词,过去分词,现在分词等。
这种结构通常用来表示一般性的陈述,而不是针对某个具体的个体或情况。它可以用于各种时态和语态,只要符
合语境和逻辑。例如:
A class of stars are forming in that nebula.(一类恒星正在那个星云中形成。 )
A class of plants were discovered in the Amazon rainforest.(一类植物在亚马逊雨林中被发现。 )
A class of metals have been used to make the new bridge.(一类金属被用来建造新的桥梁。 )
二、结构的主谓一致问题
a class of + 谓语动词这种结构的主谓一致问题,主要取决于主语的中心词是 a class 还是 of 后面的复数名词。
如果主语的中心词是 a class,表示一个整体的概念,那么谓语动词就用单数形式;如果主语的中心词是 of 后面
的复数名词,表示其中的具体成员,那么谓语动词就用复数形式。例如:
A class of drugs is under investigation for causing serious side effects.(一类药物正在被调查是否会导致严
重的副作用。 )(主语的中心词是 a class,表示一个整体的概念,谓语动词用单数。 )
A class of drugs are effective in treating high blood pressure.(一类药物对于治疗高血压有效。 )(主语的
中心词是 drugs,表示其中的具体成员,谓语动词用复数。 )
有时候,主语的中心词并不是很明确,而是根据语境和语气来决定的。这时候,谓语动词的单复数就可以灵活选
择,只要保持一致就可以。例如:
A class of students is/are taking the final exam today.(一类学生今天正在参加期末考试。 )(主语的中心
词可以是 a class,也可以是 students,谓语动词可以用单数,也可以用复数,只要和主语保持一致就可
以。 )
三、结构的变化和扩展
a class of + 谓语动词这种结构,可以根据需要进行一些变化和扩展,以适应不同的语境和表达。例如:
可以用其他表示类别的名词替换 a class,如 a type,a sort,a kind,a category,a group,a family,a
genus,a species 等。例如:
A type of music called jazz originated in the United States.(一种叫做爵士乐的音乐起源于美国。 )
A sort of fish that can glow in the dark lives in the deep sea.(一种能够在黑暗中发光的鱼生活在深海
中。 )
A kind of flower that smells like rotten meat attracts flies for pollination.(一种闻起来像腐肉的花吸引苍
蝇来传粉。 )
A category of books that are popular among teenagers are fantasy novels.(一类在青少年中很受欢迎
的书是奇幻小说。 )
A group of people who are interested in history are visiting the museum.(一群对历史感兴趣的人正在
参观博物馆。 )
A family of languages that share a common origin are called Indo-European languages.(一族有着共
同起源的语言被称为印欧语系。 )
A genus of bacteria that can cause food poisoning are called Salmonella.(一属能够引起食物中毒的
细菌被称为沙门氏菌。 )
A species of bird that can mimic human speech are called parrots.(一种能够模仿人类语言的鸟被称
为鹦鹉。 )
可以用其他表示数量的词替换 a,如 the,some,any,no,every,each,one,two,three 等。例如:
The class of students who graduated last year have all found good jobs.(去年毕业的那一类学生都找
到了好工作。 )
Some class of animals can survive in extreme environments.(有些类别的动物能够在极端的环境中生
存。 )
Any class of books that are related to science can be borrowed from the library.(任何与科学相关的类
别的书都可以从图书馆借阅。 )
Every class of students has its own characteristics.(每一类学生都有自己的特点。 )
Each class of plants has its own way of reproduction.(每一类植物都有自己的繁殖方式。 )
One class of problems that we face today is environmental pollution.(我们今天面临的一类问题是环
境污染。 )
Two classes of solutions that are often used in chemistry are acids and bases.(在化学中经常使用的
两类溶液是酸和碱。 )
Three classes of rocks that are found on Earth are igneous, sedimentary, and metamorphic.(在地球
上发现的三类岩石是火成岩,沉积岩,和变质岩。 )
可以在 of 后面的复数名词前加上限定词,如定冠词,不定冠词,所有格,指示代词,形容词等。例如:
A class of a bird that is native to Australia is the emu.(一类原产于澳大利亚的鸟是鸸鹋。 )
可以在谓语动词后面加上补语,如宾语,状语,定语,表语等。例如:
A class of students who are good at math won the competition.(一类擅长数学的学生赢得了比赛。 )
(谓语动词后面加了定语从句 who are good at math 作补语。 )
A class of metals that can conduct electricity are used for wiring.(一类能够导电的金属被用来做电
线。 )(谓语动词后面加了不定式 to conduct electricity 作补语。 )
A class of flowers that smell sweet attract bees.(一类闻起来香甜的花吸引蜜蜂。 )(谓语动词后面
加了现在分词 smelling sweet 作补语。 )
四、结构的例句和练习
下面是一些使用 a class of + 谓语动词这种结构的例句,以及一些练习题,供读者参考和练习。
A class of instruments that produce sound by vibrating strings are called string instruments.(一类通过震
动弦来发出声音的乐器被称为弦乐器。 )
A class of food that is rich in protein and calcium are dairy products.(一类富含蛋白质和钙的食物是乳制
品。 )
练习题:
A class of _ that are harmful to human health are called pollutants.(一类对人类健康有害的_被称为污染
物。 )
A class of _ that can fly in the sky are called birds.(一类能够在天空中飞翔的_被称为鸟类。 )
A class of _ that are made from flour and water are called noodles.(一类由面粉和水制成的_被称为面条。
)
A class of _ that are based on facts and logic are called arguments.(一类基于事实和逻辑的_被称为论
点。 )
答案:
A class of substances that are harmful to human health are called pollutants.(一类对人类健康有害的物质
被称为污染物。 )
A class of animals that can fly in the sky are called birds.(一类能够在天空中飞翔的动物被称为鸟类。 )
A class of food that are made from flour and water are called noodles.(一类由面粉和水制成的食物被称为
面条。 )
A class of statements that are based on facts and logic are called arguments.(一类基于事实和逻辑的陈述
被称为论点。 )
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