數(shù)詞
    數(shù)詞分為基數(shù)詞和序數(shù)詞。用于表示事物數(shù)目的詞稱為基數(shù)詞，表示事物順序的詞稱為序數(shù)詞。
    1.基數(shù)詞(1000以內(nèi)的基數(shù)詞的讀法)
    (1)1-20：one，two，three，four，five，six，seven，eight，nine，ten，eleven，twelve，thirteen，fourteen，fifteen, sixteen，seventeen，eighteen，nineteen，twenty
    2.基數(shù)詞變序數(shù)詞的方法：
    (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(gè)位的基數(shù)詞變?yōu)樾驍?shù)詞。
    twenty-first,two hundred and forty-fifth
    口訣：
    基變序，有規(guī)律;詞尾要加th。
    一二三，特殊記;詞尾分別tdd。
    八去t ，九去e ;ve則以f替。
    ty 則變作 ti ; 后面還有一個(gè)e。
    要是遇到幾十幾;只將個(gè)位變成序。
    3.數(shù)詞的應(yīng)用：
    A、時(shí)間：
    a. 整點(diǎn)：基數(shù)詞 + o’clock
    eg. It’s eight o’clock now.
    b. 幾點(diǎn)幾分：
    1.直接表達(dá)法：先小時(shí)后分
    eg. 3:25 three twenty-five
    2.間接表達(dá)法：先分后小時(shí)
    1)(<30分鐘)用past ：分鐘past 小時(shí)
    eg. 3:25 twenty-five (minutes) past three
    2) (>30分鐘)用to：(60-分鐘數(shù)) to (小時(shí)數(shù)+1)
    eg. 3:35 twenty-five (minutes) to four
    3) 30分鐘 = half 15分鐘 = a quarter
    eg. 3:30 three thirty = half past three
    3:15 three fifteen = a quarter past three.
    3:45 three forty-five = a quarter to four
    B、日期表達(dá)法：月日，年(或日月年)
    1949年10月1日 :
    October1st , nineteen forty-nine
    =the first of October, nineteen forty-nine
    2000年: the year two thousand
    =twenty hundred
    2001年: twenty o one
    3月1日: March the first = the first of March
    C、表編號(hào)：
    第207房間：Room 207
    第五課： Lesson 5 = the fifth lesson
    D、序數(shù)詞與不定冠詞(a; an)連用表“又一;再一”
    eg. You’ve done it three times. Why not try a fourth time?
    E、分?jǐn)?shù)的表達(dá)：分子(基數(shù))、分母(序數(shù))
    eg. one third 三分之一 two thirds 三分之二
    注意：1.分子超過(guò)1時(shí)，分母加s
    2.含分?jǐn)?shù)的短語(yǔ)作主語(yǔ)由分?jǐn)?shù)后的詞決定謂語(yǔ)
    eg.1)One third of the students are girls.
    2)One third of the milk is mine.
    3.分?jǐn)?shù)的特殊形式
    1)one third = a third
    2)one fourth = a quarter
    three fourths = three quarters
    3)one second = a half
    F、表約數(shù)：
    表不確定的數(shù)字時(shí)，數(shù)詞用復(fù)數(shù)。
    若帶名詞，再加of
    如：hundreds of(數(shù)百，成百上千的)，thousands of(數(shù)干，成千上萬(wàn)的)，millions of(數(shù)百萬(wàn)的)
    G、數(shù)學(xué)運(yùn)算的表達(dá)
    eg.3+5=8 Three plus/and five is eight.
    9-2=7 Nine minus two is seven.
    6x5=30 Five times six is thirty
    8÷2=4 Eight divided by two is four.
    練習(xí)
    ( )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 2nd
    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 C. 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 twentyth
    ?
    

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