高中英语语法复习专题 数 词
一、考点聚焦
1、序号表示法
(1)单纯的序号,可在基数词前加number,简写为No.。如:No.1第一号
(2)事物名词的序号表达法有什所不同:
①对于一些小序号可有序数词也可用基数词表达,形式分别为:the +
序数词 + 名词;名词 + 基数词。如:第一次世界大战可以表示为the First World War或World War One。
②对于一些大序号我们通常只用一种表达法,即名词 + 数词。如:501号房间表示为Room 501, 538路公共汽车表示为Bus 538。
③可用a / the + number + 基数词 + 名词。如:a No.5 bus一辆五路公共汽车,the No.8 bus那辆8路公共汽车。
2、倍数的表达方式
一般情况下我们用以下三种倍数表达方式:
(1)倍数用在as + 形容词 / 副词(原级)+ as结构之前。如:
They have three times as many cows as we do.
(2)倍数放在形容词或副词的比较级之前或by + 倍数用在比较级之后。如:
This rope is four times longer than that one.
They produced more products in 2001 than those in 2000 by twice.
(3)倍数用在表示度量名词前,其基本结构为:倍数 + the + size / length / weight … + of + 表示比较对象的名词,也可用于倍数 + what引导的从句中。如:
This room is three times the size of that one.
The college is twice what it was 5 years age.
You can’t imagine that rats eat 40 to 50 times their weight.
3、大约数的表示方法
(1)用ten、dozen、score、hundred、thousand、million等数词的复数后加of短语来表示几十、几百、上千、成千上万等大约数概念。如:
The little boy buys dozens of pencils every term.
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