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2018年福州升初中英語知識點總結(jié):數(shù)詞

來源:網(wǎng)絡(luò)資源 文章作者:奧數(shù)網(wǎng)整理 2018-10-07 14:44:05

  五 數(shù)詞:基數(shù)詞,序數(shù)詞一、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

  二、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。

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