七年级数词 教学案例(人教版英语七年级)

发布时间:2016-10-5 编辑:互联网 手机版

数 词

我们学过两类:基数词和序数词。基数用于表示数量多少,而基数词用于表示次序,常在日期中出现。区别:基数词前面没有“the”;序数词前一定要有“the”。

1. 最基本的基数词如下表所示:

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

*基数词的写法 :21~99 的两位数,十位与个位之间用连字符“-” 基数词的写法 。

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

百位数:个位数基数词形式加“hundred” ,表示几百,在几十几与百位间加上 and。

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

2.序数词的构成 .

1)一般来说,是由相应的基数词加词尾 th 构成。例, four+ th--- fourth six + th --- sixth seven + th --- seventh ten + th --- tenth

2)下面这些基数词在变为序数词时,有特殊的变化。例, one --- first two --- second three --- third five--- fifth eight --- eighth nine --- ninth twelve --- twelfth

3)十位整数序数词的构成方法是将基数词的词 y 变成 i,然后在加 eth.例, twenty --- twentieth thirty --- thirtieth forty --- fortieth ninety --- ninetieth

4) 两位或两位以上的基数词变为序数词时,仅将个位数变成序数词。例, twenty –one ------ twenty- first thirty-five ------thirty-fifth a hundred and fifty-three ------- a hundred and fifty- third

*基数词变序数词的口诀:

基变序,有规律;词尾加上 th(fourth, sixth)

一、二、三,单独记;结尾字母 t, d, d;

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

ve 要用 f 替; (fifth,twelfth)

整十基数变序数,ty 将 y 变成 i ;

th 前面有个 e;

要是遇到几十几,前用基来后用序。

3 分数

a) 分数的分子用基数词表示,分母用序数词表示,如果分子大于1,则分母用序数词的复数形式表示。

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,后无;前无,后有”

即 two hundred books

hundreds of books

2、分数:分子用基数词,分母用序数词;

分子大于一, 分母加 s

3、如 eight-year-old 的词后面要加名词

4、“在某人几十岁时”用 in one’s +整十的复数

如:in her fifties, in their thirties

5、表示“ 多高、多宽、多长、多深,年龄少大、

距离多远”时,用“数量+单位+形容词”

如:two months old, twenty meters deep

6. 时间的读法:

5:10, 11:30, 8:46 (顺读法)

8:05, 10:15 11:45 (逆读法)

7.日期的表达:

先掌握12个月份,星期 的写法与读法 ,实记基本的几个序数词

3月1日 :( 读法与写法)

表达日期,序数词可缩写

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

日期的写法:英语“月 日 年”

2011-7-19 :

练一练

练习:

一、请翻译下列短语。

(1)60名学生 (2)15本英语书

(3)九杯凉水 (4)4个孩子

(5)12月31 (6)6月2日

(7)第九周 (8)11+7

二、把下列基数词改成序数词。

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

三、根据括号中的数字填写合适的序数词或基数词(写单词)。

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 单项选择

( ) 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 (犹太人) 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