小學(xué)英語語法精講:數(shù)詞的分類和用法

字號:


    一、基數(shù)詞
    1)基數(shù)詞寫法和讀法: 325three hundred and twenty-five;
    2)基數(shù)詞一般是單數(shù)形式,但下列情況,常用復(fù)數(shù):
    a. 與of 短語連用,表示概數(shù),不能與具體數(shù)目連 用,如scores of people 指許多人;
    b.在一些表示“一排”或“一組”的詞組里;
    如:They arrived in twos and threes.他們?nèi)齼蓛傻牡竭_(dá)了。
    c. 表示“幾十歲”;
    d. 表示“年代”,用 in +the +數(shù)詞復(fù)數(shù);
    e. 在乘法運算的一種表示法里,如:3 x 5 = 15 Three fives is (are) fifteen.
    二、序數(shù)詞
    序數(shù)詞的縮寫形式: first—1stsecond—2ndthirty-first—31st
    三、 數(shù)詞的用法
    1)倍數(shù)表示法
    a. 主語+謂語+倍數(shù)(或分?jǐn)?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?jǐn)?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?jǐn)?shù))+ 形容詞(副詞)比較級+ than…
    The grain output is 8 percent higher this year than that of last year.
    今年比去年糧食產(chǎn)量增加8%。
    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.
    今年糧食產(chǎn)量增加了4倍。
    2)分?jǐn)?shù)表示法
    構(gòu)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(fù)數(shù):
    1/3 one-third ; 3/37 three thirty-sevenths.
    今天就和大家就分享到這,祝各位愉快!