備戰(zhàn)０８中考：英語九大詞類復習之數(shù)詞

 六、數(shù)詞

　�。ㄒ唬┗鶖�(shù)詞 在英語中表示數(shù)目的詞稱為基數(shù)詞。
　　1.基數(shù)詞的構成
　�。�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（美式）或thousand ,million（英式）,然后一節(jié)一節(jié)地表示。
　　1,001→one thousand and one
　　9,785→nine thousand, seven hundred and eighty-five
　　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（美式） seven hundred and fifty thousand million（英式）
　　2.基數(shù)詞的用法
　�。�1）作主語
　　eg.Four Of them come from Paris.
　　（2）作賓語
　　eg.一 How many books would you like？
　　一I would like two.
　　（3）作表語
　　eg.Seven minus two is five.
　�。�4）作定語
　　eg.There are three people in my family•
　�。�5）作同位語
　　eg. You two will go swimming with us.
　�。�6）表具體數(shù)字時,hundred,thousand,million用單數(shù)。
　　eg. There are six hundred students in our grade.
　�。�7）表不確定的數(shù)字時,數(shù)詞用復數(shù)。若帶名詞，再加of hundreds of（數(shù)百,成百上千的）,thousands of（數(shù)干,成千上萬的）,millions of（數(shù)百萬）
　　eg,They arrived in two sand threes.他們三三兩兩地來了。
　�。�8）表示“…十”的數(shù)詞的復數(shù)可以表示人的歲數(shù)或年代。
　　eg. He is in his early thirties.他有三十來歲（31—34歲）：
　　This took place in the 1930s.這事發(fā)生在二十世紀三十年代；
　　（9）表示時刻
　　eg.I watch CCTV News at seven o’clock every evening.