來源:網絡資源 2022-10-17 13:10:15
數詞
表示數目多少的數詞叫基數詞;
表示順序的數詞叫序數詞。
序數詞表示排列的順序
序數詞的縮寫形式為阿拉伯數字加序數詞的最后兩個字母.如:first---1st;second---2nd; third-3rd;
thirty-first---31st
基數詞變序數詞的巧記口訣
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)
數詞的用法
(1)倍數表示法
a. 主語+謂語+倍數(或分數)+ 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(分數)+ 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(分數)+ 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,表示增加多少倍
The production of grain has been increased by four times this year.
(2)分數表示法
構成:基數詞代表分子,序數詞代表分母。分子大于1時,分子的序數詞用單數,分母序數詞用復數:1/3 one-third ;3/37 three and three-sevenths
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