抽象可数名词什么时候用复数

曼昆的书里:
People face trade-offs
People respond to incentives
Governments can sometimes improve market outcomes
A country’s standard of living depends on its ability to produce goods and services
的结尾名词都是复数

Markets are usually a good way to organize economic activity
结尾名词是单数

抽象名词的单复应该如何区分使用,还是说除了特指单复都可以呢?

英语中的专有名词、物质名词和抽象名词一般为不可数名词,但有时它们却可用作复数形式。此时它们往往又有了新的含义。本文将就此类现象进行分类探讨。 一、专有名词的复数形式的含义 1.表示一家人或夫妻。例如:
Are the Smiths coming to our party tomorrow night?史密斯一家明晚会来参加我们的聚会吗?
2.表示同名或同姓的若干人。例如:
There are two Marys and three Roberts in his class.他班上有两个玛丽和三个罗伯特。
Did the Mr. Blakes come this morning?那几位布莱克先生今天上午来了吗? 二、物质名词的复数形式的含义
1.表示不同的种类,如food,wine,metal, wheat,rice等。例如:
The wines of France are among the best in the world.法国的葡萄酒是世界上最好的,
First of all,he wrote out a long list of all the foods which were forbidden。 首先他列出了一长串禁用的食品。
2.表示量很大,远远超过该词原来表示的程度或次数。这一类词常见的有: sands(沙滩,沙漠),waters(水域),rains(大阵雨、雨季),winds(大风),times(时代), woods(森林),ruins(废墟),rags(碎片、破衣服),ashes(灰烬、骨灰)。例如:
The rising waters did a lot of harm to the crops.上涨的河水给庄稼造成了很大的损害。
These caves collapse easily in heavy rains.下大雨时这些洞穴容易倒塌。 The children are playing on the sands.孩子们在沙滩上玩。
3.某些表示饮料名称的物质名词往往以复数形式代替单位词。这类词有coffees,teas等。例如:
The waitress has served twenty teas since four o’clock.从四点起,这位女服务员已上了二十份午茶。

Send two coffees and three lemonades to the room.请将两杯咖啡和三杯柠檬汁送到这个房间。
4.某些物质名词又是个体名词,它们的复数形式表示与原来个体完全不同的东西。这类词有 glasses(眼镜、玻璃杯), irons(熨斗),coppers(铜币),papers(文章,
证件)等。例如:
She is always wearing glasses.她总是戴着眼镜。
He wrote many papers for the newspaper.他为这份报纸写过许多文章。 三、抽象名词的复效形式的含义
1.congratulations, regards, respects,thanks,wishes,apologies等复数形式用来
表示祝愿、礼貌和客气。例如:
It’s your birthday today.Congratulations!今天是你的生日,恭喜你! You’ve given me so much help.Thanks a lot.你给了我很多帮助,非常感谢。 2.smiles, pities, fears, hopes, kindnesses复数形式表示强调。例如: He was all smiles.他满脸笑容。It is a thousand pities.非常遗憾。 I have received many kindnesses from him.他对我非常好。 Great fears are felt for the safety of the missing climbers. 人们对失踪的登山者的安全权为担忧。
3.抽象名词具体化。有些抽象名词的复数形式表示具体的事物,如cares(烦人的事),anxieties(令人着急的事),worries(使人发愁的事),difficulties(难题),joys(使人高兴的事),failures(失败的事,失败的人),friendships(表示友谊的事例)等。例如:
After listening to his advice,she had no more anxieties.听了他的建议,她不再有发愁的事了。
His friendships never last very long.他与别人的交情从来都不长久。
After many failures,they finally succeeded.经过多次失败之后,他们最后成功了。 4.某些抽象名词在某种场合是个体名词,它们的复数形式表示与该个体名词不同的意义,如youths(男青年、小伙子), relations(亲属), beauties(美人),
necessities(必需品)等。例如:
Twenty youths attended the meeting yesterday.二十个男青年出席了昨天的会议。 All his poor relations came to spend their holidays at his home.他所有的穷亲戚都在他家过节
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