來源:網絡資源 2022-10-17 13:10:15
數(shù)詞
表示數(shù)目多少的數(shù)詞叫基數(shù)詞;
表示順序的數(shù)詞叫序數(shù)詞。
序數(shù)詞表示排列的順序
序數(shù)詞的縮寫形式為阿拉伯數(shù)字加序數(shù)詞的最后兩個字母.如:first---1st;second---2nd; third-3rd;
thirty-first---31st
基數(shù)詞變序數(shù)詞的巧記口訣
一,二,三要全變;(one-first; two-second;three- third)
其余都加th,
th里有例外,8去t,(eight-eighth) 9去e(nine-ninth)
字母f代ve(five-fifth; twelve-twelfth);
ty變成tie(twenty-twentieth)
若要變化幾十幾,
只變個位就可以(twenty-one-twenty-first)
數(shù)詞的用法
(1)倍數(shù)表示法
a. 主語+謂語+倍數(shù)(或分數(shù))+ as + adj. + as
I have three times as many as you.我有你三倍那么多。
b. 主語+謂語+倍數(shù)(分數(shù))+ the size (amount,length…) of…
The earth is 49 times the size of the moon.地球是月球的49倍。
c. 主語+謂語+倍數(shù)(分數(shù))+ 形容詞(副詞)比較級+ than…
The grain output is 8 percent higher this year than that of last year.
d. 還可以用by+倍數(shù),表示增加多少倍
The production of grain has been increased by four times this year.
(2)分數(shù)表示法
構成:基數(shù)詞代表分子,序數(shù)詞代表分母。分子大于1時,分子的序數(shù)詞用單數(shù),分母序數(shù)詞用復數(shù):1/3 one-third ;3/37 three and three-sevenths
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