:..een20twenty21twenty-een20twenty21twenty-one22twenty-two23twenty-three24twenty-four25twenty-five26twenty-six27twenty-seven28twenty-eight29twenty-nine30thirty31thirty-one32thirty-two33thirty-three34thirty-four35thirty-five36thirty-six37thirty-seven38thirty-eight39thirty-y九十上面是基数,基本的阿拉伯数字,代表数量,下面是序数,也就是按着顺序的数字,比如,第二是second,第九是ninth,如下:基数词变序数词口诀英语中基数词变为序数词时,一般在基数词后加词尾-th,但有几个词变化特殊,只要记住下面这个口诀,这些问题即可迎刃而解。一、二、三,单独记;八去t,九除e,ve要用f替,整十基数变序数,先把ty变成tie;要是遇到两位数,十位基数个位序,th最后加上去。解析口诀:one→first,two→second,three→third这三个词变化特殊,要单独记;eight→eighth,nine→ninth,八去t,九去e后再加-th;five→fifth,twelve→twelfth,五、十二把ve换成f再加-th;twenty→twentieth,thirty→thirtieth...整十先把词尾y改为ie再加-th。两位数时则十位数用基数词,个位数用序数词,如:twenty-first。first(1st)第一second(2nd)第二third(3rd)第三(在括号里的是缩写形式,均在阿拉伯数字后面加上相应序数词的最后两个字母构成,以下各类与此相同。)这类序数词只有三个,在整个序数词里面是特殊的,就和第一类基数词一样,需要逐个地硬记下来。2、第二类:fourth(4th)第四fifth(5th)第五sixth(6th)第六seventh(7th)第七eighth(8th)第八ninth(9th)第九tenth(10th)第十eleventh(11th)第十一twelfth(12th)第十二thirteenth(13th)第十三fourteenth(14th)第十四fifteenth(15th)第十五sixteenth(16th)第十六seventeenth(17th)第十七eighteenth(18th)eenth(19th)第十九这一类序数词共有十六个。均在相应的基数词后面加上后缀-th构成。要注意其中fifth、eighth、ninth、
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