英语基数词与序数词的规律

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1. one—first two—second

three—third

由于是前三个词，很任性顽皮，长得奇形怪状的，所以需要我们特殊记。

２. four到nineteen在后面加th就可以了。但其中five, eight, nine, twelve是不听话的孩子，淘气得很。

瞧：five—fifth eight—eighth

nine—ninth twelve—twelfth

３. twenty以上的数，整十的将“y”变“ie”再加“th”,其它的两位或多位数只需将个位数变序数词就可以了。

瞧：twenty→twentieth

thirty-one→thirty-first

(375)three hundred and seventy-five→three hundred and seventy-fifth

序数词在工作时，常常懒惰地缩写成由阿拉伯数字加序数词最后两个字母的形式。

瞧：1st, 2nd, 3rd, 20th, 43th

对了，序数词还有一个特别好的朋友“the”。在句子中，“the”总是站在序数词的前面。

瞧：Sunday is the first

day of the week in America.

下面有一首小儿歌帮你记忆序数词。

基变序，有规律。

first, second, third太顽皮。

奇形怪状特殊记。

４—１９加“th”,

8, 9, 5, 12小淘气：

8没t, ９没e,

５和12, f替ve。

整十将y变ie,

再把th加上去。

多位数,更有趣,

个位变序没问题。
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