Unit 2 Numbers 语法Grammar 基数词和序数词 学案（无答案）

Unit 2 Numbers语法部分
一、基数词
1.构成
①1-12的基数词，是独立的单词，要特别记。
②13-19的基数词，一般是加teen, 13、15、18除外。three→thirteen，five→fifteen，eight→eighteen
③20-90的整数基数词，一般是加ty, 20、30、40、50比较特殊。
Two→twenty，three→thirty，four→forty，five→fifty
④21-99的非整十数的两位数，整十数+连字符+个位数构成。如：32 thirty-two ，62 sixty-two
⑤101-999的基数词，先写百位数，后加and，+十位数+个位数。
如：121 one hundred and twenty-one 101 one hundred and one
⑥1000 以上的基数词先写千位数后写百位数，再写 and，最后写十位数和个位数。
如：5281 five thousand two hundred and eighty-one
随堂练习：写出下列数字对应的英文
13 14 15
50 46 189
84, 930, 234
2.用法
①hundred, thousand, million, billion与具体数字连用的时候，不加s
如：There are two thousand students in our school. 我们学习有2000 个学生。
②hundred, thousand, million, billion与of连用的时候，加s
如：There are hundreds of people 有数以百计的人。
随堂练习：
用hundred的适当形式填空:
1. There are ____________ of students in our school.
2. Two ____________ students in our school are girl students.
3. There are ______ students in our school.
A. three hundred B. three hundreds C. three hundred of D. three hundreds of
③in one‘s + 整十”的复数，表示在某人几十岁时
如：He became a professor in his thirties．他三十多岁时成为了一名教授。
④in the + 年份的复数，表示在几世纪几十年代.
如：It was in the 1960s.那是在二十世纪六十年代。
⑤表时间
（1）表示整点可加o'clock，口语中常省略
如： -Excuse me. What's the time 打扰一下，现在几点？
　　　　-It's five (o'clock).５点。
（2）表示"几点几分"有两种形式
　A. 逆读法
　 30分以内用"分钟数+past+钟点数"，表示几点过几分。
　 超过30分钟用"分钟数+to+下一个钟点数"，表示到几点差几分。
注意：15分钟用a quarter，30分钟用half，不用fifteen或thirty，不可在后面加o'clock。
如： 7:10 ten past seven 6:50 ten to seven　　　　3:15 a quarter past three 5:30 half past five
　Ｂ.顺读法
　　第一个基数词表示钟点，第二个基数词表示分钟
如： 1:15 one fifteen 10:30 ten thirty
随堂练习：读出下列时间
6:00 7:24 8:15
9:30 10:48 11:53
12:09 2:45 3:10
⑥计算
6+7=13：Six plus seven is thirteen.= Six and seven is thirteen.
12-5=7：Twelve minus five is seven.
3×4=12：Three times four is twelve.= Three multiplied by four is twelve.
30÷6=5：Thirty divided by six is five. = Divide thirty by six is five.
随堂练习：翻译下列句子
5+4=9
15-7=8
2×6=12
36÷9=4
⑦数词表示编号
表示顺序或编号，单数名词+基数词，名词的第一个字母通常要大写。
Class Three 三班 Room 11 11号房间 No.1 Middle School 第一中学
“单数名词+基数词”可转换成“the+序数词+单数名词”，此时名词的第一个字母不大写。
Lesson Two=the second lesson第二课
用于名词之后表示顺序编号。
如：Please open your books and turn to Page 28. 请打开书翻到第 28 页。
随堂练习；My friend Mary, is in_______ in a high school in American.
A. One Class, Eight Grade B.Class One, Grade Eight C. Grade Eight , Class Three D. Eight Grade, One Class
⑧“数词+连字符+单数名词”或“数词+连字符+单数名词+连字符+形容词”构成复合形容词作定语。
如：He is an eight-year-old Chinese boy. 他是一个 8 岁的中国男孩。
随堂练习：翻译
这是一条10米宽的路。
这是一条100米深的河。
综合练习：单选
1. There are about ________ students in our school.
A. two thousand of B. two thousands C. two thousands of D. two thousand
2. Please come to my office ________.
A. at half past eight B. at half passed either C. in half past eight D. on half past eight
3. If you want to go to the cinema, take ________.
A. bus No. the ninth B. the No. 9 bus C. No. 9 the bus D. No. the ninth bus
4. The Greens came to China ________.
A. in 1984 October 27 B. in October 27, 1984 C. on 27, 1984 October D. on October 27, 1984
5. Tomorrow we are going to learn ________.
A. Lesson Second B. the Lesson Two C. Lesson Two D. second lesson
6. We talked for ________.
A. half a hour B. half hour C. an hour half D. half an hour
7. The bus will leave at ________ this afternoon.
A. three fifteen B. three and fifteen C. three quarters D. fifty to three
8. It’s a ________ ruler.
A. two-feet-long B. two feet long C. two-foot-long D. two foot long
9. ________ ago, our country was covered by thick forests.
A. Several million of year B. Several million year C. Several million years D. Several million of years
10. The tree is ________ tall.
A. forteen feet B. fourteen feet C. fourteen foot D. fourty foot
二、序数词
1.构成
①数字1、2、3需特殊记one → first (1st)，two → second (2nd)，three → third (3rd)
②4-19中，大多数在基数词后面加-th；部分基数词需要改变拼写后，再加-th
four → fourth (4th)，five → fifth (5th)，six → sixth (6th)，twelve → twelfth (12th)
③20-90的整十数，要将词尾的y变为ie，再加-th
twenty → twentieth (20th)，thirty → thirtieth (30th)
④21-99的非整十数，十位数仍用基数词，个位数用相应的序数词，并用连字符“-”连接
twenty-one → twenty-first (21st)，thirty-five → thirty-fifth (35th)
注意：基数词变序数词顺口溜
基数词表数量，序数词表次序。基序变换要牢记。
一、二、三，特殊记，词尾各是t、d、d。
th，四加起，八去t，九去e，y尾改ie。
ve结尾变f，five、twelve要牢记。
若是遇到几十几，只变个位就可以。
随堂练习：写出下列数字对应的英文
第一 第二 第三
第五十 第十二 第十三
第四十八 第九 第八十一
第一百 第一百二十二
2.序数词前通常要加定冠词the，不用定冠词的情况
①当序数词前有形容词性物主代词或名词所有格修饰时
如：It is my first job in my life.这是我人生中的第一份工作。
Anne is Mr.Brown’s second child.安妮是布朗先生的第二个孩子。
②当作为分母表示分数(母序子基，分子为复，分母加s)时
如：About two-thirds of the students attend the meeting.大约2/3的学生都参加了会议。
③当表示“再一，又一”时 (可加不定冠词)
如：Please give me a second chance. 请再给我一次机会。
④以下这种表达表示“年月日”时
如：He was born on January 8th, 1942. 他出生于1942年1月8日。
注意：用the 7th of July 7月7日表达“年月日”时，要加the
⑤当序数词在句中作状语时
如：Who got there second 谁第二个到那儿的？
3.用法
①表顺序
如：They have two children, and next year they will have a third child.
他们有两个孩子，明年他们将再有第三个孩子。
②表名次
如：He was second in the exam. 他在考试中得了第二名。
③表时间
如：May 1st is Labor Day. 5月1日是劳动节。
④表分数，母序子基，分子为复，分母加s
如： ：one fourth ：three fourths
综合练习
1.About ________ of the books in our school library are written in Chinese.
A. four-fifth B. four-fifths C. fourth-fifths D. fourths-fifth
2.The story took place in ________.
A. nineteen centuries B. nineteen century C. the nineteenth century D. nineteenth century
3.________ letter of the word “restaurant” is “n”.
A. The nineth B. Nineth C. The ninth D. Ninth
4.________ of the work has been done.
A. Two third B. Two three C. Two thirds D. Two third
5.December is ________ and last month is a year.
A. the twelveth B. twelveth C. the twelfth D. twelfth
6.________ of the teachers in the school are from colleges.
A. Three quarters B. Two-third C. Two fifth D. Two-nineths
7.There are two world wars during ________ century.
A. the twenties B. the twentieth C. twenties D. twentieth
8.Mr. Smith lives on ________ floor.
A. fiveth B. fifth C. the fiveth D. the fifth
9.I think________ lesson is the most difficult in this book.
A. five B. fifth C. the fifth D. fifteen