SectionAPeriod2(1a-2a)Unit8Whenisyourbirthday?.,有规律,词尾加上th。123,特殊记,词尾字母t,d,d。8去t,9去e,f来把ve替。eenthtwentieth11th12th13th14th15th16th17th18th19th20th基数词序数词twenty-onetwenty-twotwenty-yhundredtwenty-firsttwenty-secondtwenty-iethhundredth21st22nd23rd30th40th50th60th70th80th90th100th整十y变i,-first22ndtwenty-second23rdtwenty-third24thtwenty-fourth25thtwenty-fifth26thtwenty-sixth30ththirtieth31stthirty-,第2,第3:first,second,---第19:-th:fourth,(five)fifth,sixth,seventh,(eight)eighth,(nine)ninth,tentheleventh,(twelve)twelfth,thirteenth,fourteenthfifteenth,eenth序数词的变化方法
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