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课件网) 【知识精讲】单词词组———序数词 五年级 英语 发布课文朗读任务 (任务-发布任务-自定义任务) 定义: 序数词是数词的一种,表示顺序的词。 the first the second the third one-first two-second three-third 一、二、三单独记 一般序数词无特殊 基数词后加th就可以 four-fourth seven-seventh ten-tenth 八去t, 九去e nine-ninth eight-eighth twelve-twelfth ve要用f替 (5和12是把ve变成f, 再加th) 5th 12th five-fifth 学习整十序数词的变化规律: twenty-twentieth thirty-thirtieth forty-fortieth fifty-fiftieth 整十基数变序数,把ty变tie,最后th加上去。 几十几的序数词变化: twenty-one twenty-first twenty-two twenty-second 若是遇上几十几,十位基数个位序,连字符号莫丢弃。 基变序,有规律,词尾加上th; 一,二,三,特殊记,词尾字母t,d,d; 八去t,九除e,ve要用f替; 要是遇上几十几,十位基数个位序; 整十基数变序数,先把ty变tie,最后th加上去。 序数词短语: 1. the first time 2. on the second floor 3. on April 19th, 2017 选择最佳答案。 ( )The library is on the _____ floor. A. one B. two C. first 选择最佳答案。 ( )The library is on the _____ floor. one B. two C. first 答案:C 变形计。(用所给单词的适当形式填空) Today is Friday, November _____ ( five). 答案:the fifth 变形计。(用所给单词的适当形式填空) Today is Friday, November _____ ( five).