2017中考英語數(shù)詞知識點:序數(shù)詞的構(gòu)成

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序數(shù)詞的構(gòu)成
    ①序數(shù)詞多數(shù)由"基數(shù)詞-th"構(gòu)成,序數(shù)詞前一般加定冠詞the
    ②少數(shù)序數(shù)詞構(gòu)成屬特殊情況
    e.g. One-first two-second three-third five-fifth eight-eighth nine-ninth twelve-twelfth
    ③以y結(jié)尾的十位整數(shù),先將y改為i,再加-eth e.g. thirty-thirtieth
    ④21以上的多位數(shù),要將末位數(shù)改為序數(shù)詞,前面其他位數(shù)仍用基數(shù)詞
    e.g. eighty-three-eighty-third nine hundred and sixty-two-nine hundred and sixty-second
    ⑤序數(shù)詞的縮寫形式由阿拉伯?dāng)?shù)字加序數(shù)詞的后兩個字母構(gòu)成
    e.g. first-1st second-2nd