语法专题三数词 考点一基数词 1.基数词：用于表示事物数量的词称为基数词one two three four five six seven eight nine ten eleven twelve 2.大数的读法 (1000 以内的基数词的读法) 365 three hundred and sixty-five 505 five hundred and five 3.基数词的作用 （1）表示数量I have six pencils.我有六支铅笔 （2）表示时刻A、时刻表达法： a.整点：基数词+ oclock eg. It s eight o clock now. b.几点几分： 1顺读表达法：先小时后分eg. 3:25 three twenty-five 2. 倒读表达法：先分后小时 1)(30 分钟 )用 to：(60-分钟数 ) to (小时数 +1) eg. 3:35 twenty -five (minutes) to four 3) 30 分钟= half 15 分钟 = a quarter 3:30 three thirty = half past three 3:15 three fifteen = a quarter past three. 3:45 three forty-five = a quarter to four （3）表示编号顺序(名词在前，基数词在后且首字母要大写) 如：Class Four Grade Nine 九年级 4 班Room 207： 207 房间 (4) 表示“又，再”基数词 +more+复数名词 = another+基数词 +复数名词 （5） 表示 几十岁 ， in one s +整拾复数例如： He died still in his forties ； （6）表示 年代 ，用in +the +年份的复数。
如in the1940s （在 20 世纪 40 年代） 考点二序数词： 表示事物顺序的词称为序数词 1.基数词变序数词：（基变序，有规律，结尾加上th） eg. one first two second three third （一二三，特殊例，结尾字母t d d） eight eighth nine ninth twelve twelfth （八去 t, 九去 e, ve 要用 f 替） twenty twentieth （ty 将 y 变 ve, 后加 th 别忘记） twenty-one -twenty-first （要是遇到几十几，只变个位就可以） 2.序数词的应用： （1） 、 表示事物顺序， 意思是“第几” I m thirteen years old, Today is my thirteenth birthday. 今 年我十三岁，今天是我第十三个生日序数词前有my, his 等 限定词修饰时，不能 再用定冠词the） （2） 、日期表达法：月日，年（或日月年） 1949 年 10 月 1日 : October1st , nineteen forty -nine 3 月 8 日: March8th = the eightht of March （3）序数词与不定冠词(a; an)连用表“又一；再一” eg. You ve done it three times. Why not try a fourth time? 考点三、分数 1.分数的表达：分基母序，分子用基数，分母用序数，分子超过1 时，分母加s eg. one third 三分之一two thirds 三分之二 注意： 1.含分数的短语作主语由分数后的词决定谓语 eg.1) One third of the students are girls. 2) One third of the milk is mine. 2.分数的特殊形式 1) one second = a half one third = a third 2)one fourth = a quarter three fourths = three quarters 考点四、准确数和模糊数（模糊数字两有，具体数字两无s和 of） 1.准确数字hundred ， thousand ，million 等词与具体数字（如one, two, three, a few several）连用时，用单数形式，不与of 连用。
2. 模糊数字hundreds of ; thousands of ; millions of一些数词的复数+ of 表约数 练习 ( )1.If you go out at night, you ll be able to see _ starts. A. thousands of B. thousand of C. nine thousands of D. thousands ( )2.Monday is _ day of the week. A. first B. the first C. the second D. second ( )3.You ve done it twice. Why not try _ time? A. third B. the third C. a third D. once ( )4.Which is the_ month? It s September. A. nine B. nineth C. ninth D. ninety ( )5.December is _ of the year. A. the twelfth months B. the twelfth month C. the twelveth months D. twelve months ( )6.There are _ floors in the building and he lives on the _ floor. A. eighteen, fifteen B. eighteenth, fifteenth C. eighteen, fiveteen D. eighteen, fifteenth ( )7.I was born _, 1982. A. on June 2rd B. in June 2 nd C. on June two D. on June 2 ( )8.It s _ from our home to the zoo. A. two and a half hours walk B. a half and two hours walk C. two hours and a half hour s walk D. two and a half hour s walk ( )9.What time is it now? It s _ to six. A. quarter B. a quarter C. quarto D. a quarto ( )10.Will you be back in _ ? A. one or two minutes B. one minute or two C. two minutes or one D. two or one minute ( )11.Mary s uncle went to France _. A. in his thirties B. on his thirties C. at his thirties D. about his thirties ( )12.The headmaster wrote a _ report. A. two thousand words B.two -thousand-words C. two-thousand words D. two -thousand-word ( )13._of the apples in the fruit bowl are soft and sweet. A. Two -third B. Second-third C. Two-thirds D. Second-thirds ( )14.We have learned about _ these days. A. several hundreds English words B. hundreds of English words C. hundred of English words D. several hundred English word ( )15.A UN report says that the word population will pass six billion by the end of _ century. A. twentieth B. twenty C. the twentieth D. the twentieth 。