初中英语语法大全：数词定义：表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。I 基数词1.基数词的构成（1）1-20one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty（2）21-99 先说“几十”，再说“几”，中间加连字符。23—twenty-three,34fthirty-four,45fforty—five,56—fifty-six,67fsixty-seven,78fseventy-eight,89feighty-nine,91fninety-one（3）101—999 先说“几百”,再加 and,再加末两位数或末位数；586—fivehundredandeighty-six,803—eighthundredandthree（4）l,000 以上,先从右往左数，每三位数加一个“,”,第一个“,”前为thousand.第二个"，”前为 million,第三个"，”前为 billion（美式）或thousand,million（英式）,然后一节一节地表示。1,001—onethousandandone9,785—ninethousand,sevenhundredandeighty-five18,423—eighteenthousand,fourhundredandtwenty-three6,260,309—sixmilliontwohundredandsixtythousandthreehundredandnine750,000,000,000—sevenhundredandfifty,billion（美式）sevenhundredandfiftythousandmillion（英式）2.基数词的用法（1）作主语eg.FourOfthemcomefromParis.（2）作宾语eg.—Howmanybookswouldyoulike？—Iwouldliketwo.（3）作表语eg.Sevenminustwoisfive.（4）作定语eg.Therearethreepeopleinmyfamily（5）作同位语eg.Youtwowillgoswimmingwithus.（6）表具体数字时,hundred,thousand,million 用单数。eg.Therearesixhundredstudentsinourgrade.（7）表不确定的数字时,数词用复数。若带名词,再加 of。hundredsof（数百，成百上千的）thousandsof（数干，成千上万的）millionsof（数百万）twothousand（两千）Thousandsandthousandsofpeoplehavevisitedthecity.成千上万的人参观了这座城市。（8）在—些表示“—排”或“—组”的词组里；eg,Theyarrivedintwosandthrees.他们三三两两地来了。(9) 表示“…十”的数词的复数可以表示人的岁数或年代。eg.Heisinhisearlythirties.他有三十来岁(31—34 岁):Thistookplaceinthe1930s.这事发生在二十世纪三十年代；(10)表示时刻钟点表达法。顺读法(钟点＋分钟)如:4:30fourthirty4:45fourforty-five4:15fourfifteen 倒读法(分钟+to/past+钟点)如:4:30halfpastfour4:15fift...
