(共25张PPT)
四、数词
考点一 基数词
数字 基数词形式 例词
0~12 各自独立 zero 0; one 1; nine 9;
twelve 12
13~19 3~9+重读teen结尾 特殊:thirteen 13; fifteen 15; eighteen 18
一般:fourteen 14;
sixteen 16
20~90整十位数 以ty结尾 twenty 20; thirty 30; forty 40; fifty 50; sixty 60; seventy 70; eighty 80; ninety 90
数字 基数词形式 例词
两位数(几十几) 整十位数-个位数 twenty-one 21; thirty-five 35; ninety-eight 98
三位数(几百几) . . . hundred
and+两位数 seven hundred and eighty-five 785; two hundred and ten 210
多位数 从右向左数起,每隔三位数加一个逗号,依次为thousand(千),million(百万),billion(十亿), 逗号中间三位数 76, 832, 154, 968
seventy-six billion eight hundred and thirty-two million one hundred and fifty-four thousand nine hundred and sixty-eight
【巧学妙记】巧记100以内的基数词
基数词不难记,找清规律很容易;十二以内词各异,
十三数到十九去,后加teen莫忘记;
二十、三十至九十,正式之后有-ty;
要说“几十几”,中间“-”别丢弃;
a hundred是“一百”,请你记住莫大意。
考点二 序数词
数字 序数词变化规则 例词
1、2、3 不规则变化 first第一; second第二;third第三
4~19 基数词词尾加th 特殊:fifth 第五; eighth 第八;ninth 第九;twelfth第十二
一般:fourth第四;
nineteenth第十九
20、
30 ……
90 ty变为tie再加th twenty→twentieth第二十
ninety→ninetieth第九十
两位数或多位数(整数除外) 只变个位数
(hundred, thousand
等只在词尾加th) twenty-third 第二十三;one hundred and fifty-ninth 第一百五十九;hundredth 第一百
【温馨提示】
(1)序数词要加定冠词the,但若序数词前有形容词性物主代词或名词所有格时省略the。例如:
Tom made the mistake for the third time. = It was Tom’s third time to make the mistake. 这是汤姆第三次出错。
(2)序数词前加a/an表示“又一,再一”。例如:
Even though the Greens have 3 children, they still want a fourth one.
尽管格林夫妇已有3个孩子,可他们还想再要一个。
(3) 序数词可以用阿拉伯数字和序数词拼写的最后两个字母简写。例如:
1st第一,2nd第二,3rd第三,4th第四。
【巧学妙记】基数词变序数词规律
基变序,有规律,末尾加上-th。
一、二、三特殊记,面目全非要注意。
八加th,九去e,ve要用f替。
逢十改y为ie,后跟-th莫忘记。
若想表示几十几,只变个位就可以。
考点三 数词应用
名称 表 达 法 例 词
年份
日期 月,日,年(日用序数,年用基数)
特别提示:年份的读法可先读前两位数, 再读后两位数, 读日时要加the 1997年3月21日—March the twenty-first, nineteen ninety-seven
日,月,年 (the+序数词+of+月,年) 2007年3月21日—the twenty-first of March, two thousand and seven
年代 in+the+数词的复数形式 在18世纪20年代—in the 1720’s/1720s
读作:in the seventeen twenties
名称 表 达 法 例 词
时
刻 时在前,分在后,按基数词读 10: 15 ten fifteen
分在前,时在后 “几点过几分”用past,分钟数须小于半小时(包括半小时在内) 7: 05 five past seven
7:15 fifteen past seven
7: 30 half past seven
“几点差几分”,用介词to,但分钟数须在半小时以内(不包括半小时在内) 7: 57 three to eight
11: 46 fourteen to twelve
2: 40 twenty to three
几刻钟 一刻钟:a quarter
三刻钟:three quarters
九点一刻:a quarter past nine
名称 表 达 法 例 词
编
号 给东西编号时,序号在前用序数词,序号在后用基数词 lesson twelve
=the twelfth lesson
分
数 分子用基数词,分母用序数词 记忆口诀:分子基,分母序,分子大于1,分母加s
特别提示: 通常用
a/one half表示。 用
a/one quarter表示 one third
two thirds
four fifths
seven tenths
带分数:当分数前面带有整数时,要用连词and连接
two and two thirds
名称 表 达 法 例 词
倍数 英语用twice表示两倍,两倍以上用基数词加times表示 twice两倍
three times三倍
forty times四十倍
Ⅰ. 用所给数词的适当形式填空
1. (2012·遵义中考)I have tried three times, and the teacher asks me to have a _______ (four) try.
2. (2011·扬州中考)Even a child knows September is the _______ (nine) month of a year.
答案: 1. fourth 2. ninth
3. (2011 ·烟台中考)I’ve bought a present for my father’s _______ (forty)birthday.
4. (2011·肇庆中考)Mr. Smith lives on the _______ (six) floor.
5. (2011·上海中考) Climb up to the _______ (eleven) floor, and you can enjoy a better view.
答案: 3. fortieth 4. sixth 5. eleventh
Ⅱ. 单项选择
1. (2012·六盘水中考)There are _______ days in a week and Tuesday is _______ day of the week.
A. seven; third B. seven; the third
C. seventh; three D. the seventh; three
【解析】选B。句意:一个周有七天,星期二是一个周的第三天。第一个空用基数词表示数量,第二个空用序数词表示次序,且其前加the。故选B。
2. (2011·东营中考)—There are 60 students in my class and 44 of them use weibo very often.
—44 That means about _______ of your classmates are weibo users, right
A. half B. one third
C. two thirds D. three quarters
【解析】选D。考查数词的用法。half二分之一; one third 三分之一; two thirds三分之二; three quarters四分之三。由常识可知44大约是60的四分之三, 故选D。
3. (2011·眉山中考)Eight _______ students in our school are from countryside.
A. hundreds B. hundred
C. hundreds of D. hundred of
【解析】选B。hundred,thousand,million等词与基数词连用时应该用单数形式,不能与of短语连用。故选B。
4. (2012·恩施中考)He wrote his _______ novel when he was _______.
A. five; fifties B. fifth; fifty
C. fifth; fiftieth
【解析】选B。句意:当他五十岁的时候,他写了他的第五部小说。第一个空用序数词表顺序,第二个空用基数词表年龄。
5. (2011·怀化中考)July 1st of this year is _______ birthday of CPC (中国共产党).
A. ninety B. the ninety C. the ninetieth
【解析】选C。句意:今年7月1日是党的第九十个生日。表达第多少个生日时用序数词,故选C。
6. (2011·衡阳中考)Kangkang is a school boy. He got a good gift on his _______ birthday.
A. fourteenth B. fortieth C. the fortieth
【解析】选A。由school boy可知康康应该是十四岁,而不是四十岁。表达生日时用序数词,序数词与物主代词连用时,其前面的冠词要省略。故选A。
7. (2011·德阳中考) I don’t believe that this _______ boy can paint such a nice picture.
A. five years old B. five-years-old
C. five-year-old
【解析】选C。由“数词-名词-形容词”构成的复合形容词作定语时,其中间的名词用单数形式,故选C。
8. (2012·铜仁中考)About _______ of the students in Grade Nine this year were born in the _______.
A. three five; 1996
B. three fifths; 1990s
C. third fifth; 1997
D. third fifths; 1990s
【解析】选B。分数的构成为分子用基数词,分母用序数词,分子如果大于1,则分母序数词一般都用复数形式,故选B。
9. (2011·达州中考)—If a=4, b=5, what’s the answer to the question “a+2ab+1= ”
— _______.
A. Forty-fifth
B. Forty-five
C. Twenty-three
D. One hundred and twenty-one
【解析】选B。 考查基数词的表达。由题意a=4,b=5 可知 a+2ab+1=45。forty-five表示45。故选B。
10. (2011·烟台中考)—Do you have enough students to clean the laboratory
—No, I think we need _______ students.
A. another B. two others
C. more two D. two more
【解析】选D。数词与more连用时放在more的前面,与another连用时放在another的后面。故选D。