七年級數詞 教學案例(人教版英語七年級)

          發布時間:2016-10-5 編輯:互聯網 手機版

          數 詞

          我們學過兩類:基數詞和序數詞。基數用于表示數量多少,而基數詞用于表示次序,常在日期中出現。區別:基數詞前面沒有“the”;序數詞前一定要有“the”。

          1. 最基本的基數詞如下表所示:

          1~10 1 one 2 two 3 three 4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten

          11~19 11 eleven 12 twelve 13 thirteen 14 fourteen 15 fifteen 16 sixteen 17 seventeen 18 eighteen 19 nineteen

          20~100 20 twenty 30 thirty 40 forty 50 fifty 60 sixty 70 seventy 80 eighty 90 ninety 100 one hundred

          *基數詞的寫法 :21~99 的兩位數,十位與個位之間用連字符“-” 基數詞的寫法 。

          例:21 twenty - one 32 thirty - two 99 ninety – nine

          百位數:個位數基數詞形式加“hundred” ,表示幾百,在幾十幾與百位間加上 and。

          例:101 a hundred and one. 320 three hundred and twenty 648six hundred and forty-eight

          2.序數詞的構成 .

          1)一般來說,是由相應的基數詞加詞尾 th 構成。例, four+ th--- fourth six + th --- sixth seven + th --- seventh ten + th --- tenth

          2)下面這些基數詞在變為序數詞時,有特殊的變化。例, one --- first two --- second three --- third five--- fifth eight --- eighth nine --- ninth twelve --- twelfth

          3)十位整數序數詞的構成方法是將基數詞的詞 y 變成 i,然后在加 eth.例, twenty --- twentieth thirty --- thirtieth forty --- fortieth ninety --- ninetieth

          4) 兩位或兩位以上的基數詞變為序數詞時,僅將個位數變成序數詞。例, twenty –one ------ twenty- first thirty-five ------thirty-fifth a hundred and fifty-three ------- a hundred and fifty- third

          *基數詞變序數詞的口訣:

          基變序,有規律;詞尾加上 th(fourth, sixth)

          一、二、三,單獨記;結尾字母 t, d, d;

          (first,second,third) 八去 t,九去 e,(eighth,ninth) ;

          ve 要用 f 替; (fifth,twelfth)

          整十基數變序數,ty 將 y 變成 i ;

          th 前面有個 e;

          要是遇到幾十幾,前用基來后用序。

          3 分數

          a) 分數的分子用基數詞表示,分母用序數詞表示,如果分子大于1,則分母用序數詞的復數形式表示。

          b) 1/2,one half, 2/3, two-thirds, 1/3, one-third, 1/4 , one fourth (one quarter), , three-fourths

          注意

          1、“前有,后無;前無,后有”

          即 two hundred books

          hundreds of books

          2、分數:分子用基數詞,分母用序數詞;

          分子大于一, 分母加 s

          3、如 eight-year-old 的詞后面要加名詞

          4、“在某人幾十歲時”用 in one’s +整十的復數

          如:in her fifties, in their thirties

          5、表示“ 多高、多寬、多長、多深,年齡少大、

          距離多遠”時,用“數量+單位+形容詞”

          如:two months old, twenty meters deep

          6. 時間的讀法:

          5:10, 11:30, 8:46 (順讀法)

          8:05, 10:15 11:45 (逆讀法)

          7.日期的表達:

          先掌握12個月份,星期 的寫法與讀法 ,實記基本的幾個序數詞

          3月1日 :( 讀法與寫法)

          表達日期,序數詞可縮寫

          1 , 2 , 3 ,4 , 20 , 21 , 22 ,23 ,24

          日期的寫法:英語“月 日 年”

          2011-7-19 :

          練一練

          練習:

          一、請翻譯下列短語。

          (1)60名學生 (2)15本英語書

          (3)九杯涼水 (4)4個孩子

          (5)12月31 (6)6月2日

          (7)第九周 (8)11+7

          二、把下列基數詞改成序數詞。

          one--- two--- three--- nine--- fourteen--- twenty---thirty-five--- five eight

          三、根據括號中的數字填寫合適的序數詞或基數詞(寫單詞)。

          1、Bill is (14)years old , he is in Class (2)Grade (6).

          2、My birthday is on the (3)of March .

          3、September is the (9)month in a year .

          4、Which boy is thinner , the (1)one or the (2)one ?

          5、There are (55)students in our class .

          四 單項選擇

          ( ) 1. We’ve planted _______ trees in the center of

          our city this year. (2000)

          A. hundred B. two hundreds

          C. hundred of D. hundreds of

          ( ) 2. About ______ films were shown during the

          5th Shanghai International Film Festival. (2001)

          A. two hundred of B. two hundreds of

          C. two hundred D. two hundreds

          ( ) 3. We’ll have a ______ holiday. What about

          going to the West Lake? (2002)

          A. two days B. two-day

          C. two-days D. two-days’

          ( ) 4. Now children, turn to page ______ and look

          at the _____ picture in Lesson Two. (2003)

          A. twentieth; one B. twenty; one

          C. twentieth; first D. twenty; first

          ( ) 5. During the seven-day May Day holiday,

          _____ families went sightseeing. (2004)

          A. thousand B. thousands

          C. thousands and thousands D. thousands of

          ( ) 6. During World War II, a Jewish (猶太人) lady was

          protected by a local family in Shanghai in

          her ________. (2005)

          A. fifties B. fifty C. fiftieth D. the fiftieth

          答案:DCBDD A

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