英语的数词可以分为基数词和序数词两大类

  数词的基本作用有两个:

  一、作限定词,与名词一起构成词组,如:one banana,the first time,the second longest river;

  二、用作名词词组的中心词,与其他的限定词一起构成名词词组,在句子中充当主语、宾语、主语补足语、同位语和状语。

  作主语:Two of the students are absent today.

  作宾语:She only likes one of the books given by her father.

  作主语补足语/表语: :Ten divided by two is fine./She's only seventeen.

  作同位语:We three are all willing to help you.

  作状语:The yellow river is the second longest river in china.

  平常生活中经常要碰到很多数字问题,在使用时我们要特别注意以下几点:

  1. 序数词和基数词  five――fifth   twelve――twelfth      twenty――twentieth

  基数词变序数词。其规律为:

  1,2,3特殊记,加th从4起 (first,second,third,fourth)

  8少t,9去e,千万别忘记 (eighth,ninth)

  逢5逢12,ve变f (fifth,twelfth)

  20到90,y要变ie (twentieth,ninetieth)

  若是几十几,前基后序别倒位 (ninety-first)

  21-99的两位数,在十位数和个位数之间加连字符构成:56-fifty-six

  注意以下几个不规则的序数词的拼写

  first(第一);    second(第二);     third(第三);

  eighth(第八);  ninth(第九);       twelfth(第十二)

  2. 顺序(编号)表示法  一般来说,编号有两种表示法:

  (1) 事物名词+基数词

  (2) 定冠词the+序数词+事物名词

  eg.第一次世界大战 World War One/ the first World War

  304教室  Room 304

  3.序数词的一个特殊用法

  the first/last to do sth第一个做sth的人

  eg. My mother is always the first to get up and the last to go to bed in my family.

  

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