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基礎(chǔ)英語

數(shù)詞的語法基礎(chǔ)知識介紹

時間:2024-07-20 14:38:59 基礎(chǔ)英語 我要投稿
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數(shù)詞的語法基礎(chǔ)知識介紹

  數(shù)詞有基數(shù)詞和序數(shù)詞兩大類。小編整理了數(shù)詞的語法基礎(chǔ)知識介紹,歡迎欣賞與借鑒。

數(shù)詞的語法基礎(chǔ)知識介紹

  基數(shù)詞

  (1)1-20

  one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen,seventeen,eighteen,nineteen,twenty

  (2)21-99 先說“幾十”,再說“幾”,中間加連字符。

  23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one

  (3)101—999先說“幾百”,再加and,再加末兩位數(shù)或末位數(shù);

  586→five hundred and eighty-six,803→eight hundred and three

  (4)l,000以上,先從右往左數(shù),每三位數(shù)加一個“,”,第一個“,”前為thousand.第二個“,”前為million,第三個“,”前為billion

  1,001→one thousand and one

  18,423→eighteen thousand,four hundred and twenty-three

  6,260,309→six million two hundred and sixty thousand three hundred and nine

  750,000,000,000→seven hundred and fifty billion

  序數(shù)詞

  (1)一般在基數(shù)詞后加th

  eg.four→fourth,thirteen→thirteenth

  (2)不規(guī)則變化

  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),變y為ie再加th

  twenty→twentieth, forty→fortieth, ninety→ninetieth

  (4)從二十一后的“幾十幾”直至“幾百幾十幾”或“幾千幾百幾十幾”只將個位的基數(shù)詞變?yōu)樾驍?shù)詞。

  twenty-first,two hundred and forty-fifth

  基數(shù)詞轉(zhuǎn)為序數(shù)詞的口訣:

  基變序,有規(guī)律,詞尾加上-th.

  一,二,三,特殊記,詞尾字母t,d,d.

  八去t,九去e, ve要用f替。

  ty將y變成i,th前面有個e.

  若是碰到幾十幾,前用基來后用序。

  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 and three-sevenths.

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