数词复习
教学目标:
1.知识目标:理解数词概念及用法;
2.能力目标:掌握常见数词的表达法;
3.情感目标:培养学生生活中时时处处用数词的自然性,习惯性。
教学重点: 基数词,序数词,分数,百分数
教学难点: 基数词转化为序数词,分数的构成
教学方法: 对比总结,归纳演绎,多媒体呈现
教法设计:本节课主要是针对数词进行教学,首先引导学生深入课题---数词,然后通过问答,举例使学生理解数词概念及其用法,并引导学生总结基数词变序数词的规律,接下
来通过习题练习掌握,最后通过互动游戏提高学生学习数词的积极性,在课堂将要
结束时发给练习习题。
学法设计:教师通过多媒体呈现引导学生上板默写,组织讨论,认识规律,掌握学习新知识的方法和途径,最后通过练习掌握所学内容。
教学步骤:
考点一数词的构成
1.基数词的构成
(1)0—12单独记。
如: zero, one, two, three等。
(2)13—19的词尾都是teen。
如:fourteen, seventeen等,但13—thirteen,15—fifteen,18—eighteen需要特殊记。
(3)20以上的整十的基数词均以ty结尾。
如:20—twenty,30—thirty,40—forty,50—fifty,80—eighty等。
(4)“几十几”要加连字符号“-”。
如:48—forty-eight, 97—ninety-seven 等。
(5)“几百几十”或者“几百几十几”在“百”后加and。
如:156—one hundred and fifty -six, 509—five hundred and nine等。
(6)四位数或者四位数以上的基数词的拼写规律:用逗号从右往左每三位加一个逗号,第一个逗号读作thousand(千),第二个逗号读作million(百万),第三个逗号读作billion(十
亿),hundred后莫忘“and”。
如:3,610=three thousand six hundred and ten;
94,295=ninety-four thousand two hundred and ninety-five;
274,350=two hundred and seventy four thousand three hundred and fifty等。
2.序数词的构成
(1)“第一”、“第二”、“第三”分别是 first,second, third。
(2)“第四”到“第十九”除了fifth, eighth, ninth, twelfth是特殊的拼写外,其余的都在相应基数词后面加“-th”构成。
如:fourth。
(3)20以上的整十的序数词由相应的基数词变y为i,再加“-eth”。
如:thirty→thirtiethfifty→fiftieth。
(4)第一百hundredth; 第一千thousandth; 第一百万mil- lionth。
(5)20以上的非整十的基数词变序数词时,只变化个位数。
如:twenty-one→twenty -first; one hundred and one→one hundred and first。
基数词变序数词的巧记口诀:
基变序,有规律,
一、二、三特殊记,
八去t,九去e, ve要用f替;
整十变y为ie再加-th,
若想表示几十几,只变个位就可以。
跟踪练习:
1. There are _____ people in Jack’s family. They live in the ______ building. ( )
A. five, fifth
B. five, five
C. fifth, fifth
D. fifth, five
2. The river is only_________, so we can swim across it. ( )
A. 20 meters long
B. 20 meters wide
C. 20-meter long
D. 20-meter wide
3. —What should we do now, Mr. Clark?
Please turn to Page ______ and look at the ______ picture.
A.Nine; eighth B. Ninth; eighth C. Nine; eight D. Ninth; eight
考点二数词的表达方式
March 12, 2014 2014年3月12日
one third 三分之一
two thirds 三分之二
five(o'clock) 5点钟
five past seven 7点5分
twenty to eight 7点40分
Page 62/the sixty-second page 第六十二页in the 1970s 在二十世纪七十年代
in his forties 在他四十多岁时
跟踪练习:
1.When John was ________, he went to London to go on his university. ( )
A. on his twenties
B. in his twenties
C. in the twenties
D. in his twenty
2. The small girl was born on __________.( )
A. 2007 June 6
B. June 6 2007
C. June 6, 2007
D. June, 6, 2007
3. In our school, ________ of the students are boys. ( )
A. two third
B. three fifth
C. four-fifth
D. four sevenths
4. 10:23 is __________.( )
A. ten past twenty-three
B. twenty-three to eleven
C. twenty-three past ten
D. ten twenty three
考点三数词的注意事项
1.hundred,thousand,million前有基数词修饰时,
表示确数,其后不加-s,也不与of连用;但若用于表示
“数百、数千、数百万”这样的泛指概念时,后面则加-s,
并与of连用。
There are two hundred people in the meeting.
会上有200人。
Thousands of people go to the beach every year.
每年成千上万的人到海滨去。
Millions of people in the world are sending and receiving
e-mails every day.
每天,世界上有数百万人在收发邮件。
2.序数词的前边加不定冠词a,表示“再一、又一”。
I'll have to do it a second time.
我得再做一次。
(已经做过一次)
跟踪练习:
1. We can see ______ stars at night if it is fine. ( )
A. thousand of
B. two thousands
C. three thousands of
D. thousands of
2. By the end of last year we had planted about___trees. ( )
A.five hundreds
B. five hundreds of
C. five hundred of
D. five hundred
3. —I hear your friend is visiting Sanya again. Is it the second time for him?
—Yes, and he will come for ______ time next spring. ( )
A. a third
B. a second
C. the third
D.three
4. It’s said that __ of the water around the world __polluted. ( )
A.two third; has
B. two thirds; have
C. two third; are
D. two thirds; is
小结归纳:
本节课主要学习了数词的用法,包括数词的构成,数词的表达方式和数词的注意事
项。
数词是中考必考考点之一,希望通过本节课的复习,学生能基本掌握数词的用法。
作业布置:
做好对应练习。
教学反思:。