英语中基数词变为序数词时,一般在基数词后加词尾-th,但有几个词变化比较特殊,只要记住下面这个口诀,这些问题就可以迎刃而解。一、二、三,单独记;八去t,九除e,五、十二中f变ve,再加词尾-th;整十基数变序数,先把y尾改ie;要是遇到两位数,十位基数个位序。解析:one→first,two→second,three→third这三个词变化最特殊,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→ In English, when the base numeral becomes an ordinal, the suffix -th is usually added after the base numeral. However, there are a few words that have a special change. As long as you remember the following formula, these problems can be solved easily. One, two, three, a separate mind; eight to t, nine except e, five, twelve f ve, plus suffix -th; ten base variable, first y tail to change ie; Number, ten base sequence. Analysis: one → first, two → second, three → third The three words change the most special, to remember; eight → eighth, nine → ninth, eight to t, nine to e plus -th; twelve → twelfth, five, twelve ve replaced f plus-th; twenty → twentieth, thirty →