【预习】初中英语语法《序数词》视频讲解+知识点+练习
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视频讲解
表示数目多少或顺序多少的词叫数词。数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。
下面把1－99的序数词也分为四个类。
第一类
first (1st) 第一
second (2nd) 第二
third (3rd) 第三
（在括号里的是缩写形式，均在阿拉伯数字后面加上相应序数词的最后两个字母构成，以下各类与此相同。）这类序数词只有三个，在整个序数词里面是特殊的，就和第一类基数词一样，需要逐个地硬记下来。
第二类：
fourth (4th) 第四
fifth (5th) 第五
sixth (6th) 第六
seventh (7th) 第七
eighth (8th) 第八
ninth (9th) 第九
tenth (10th) 第十
eleventh (11th) 第十一
twelfth (12th) 第十二
thirteenth (13th) 第十三
fourteenth (14th) 第十四
fifteenth (15th) 第十五
sixteenth (16th) 第十六
seventeenth (17th) 第十七
eighteenth (18th) 第十八
nineteenth (19th) 第十九
这一类序数词共有十六个。均在相应的基数词后面加上后缀－th构成。要注意其中fifth、eighth、ninth、twelth四个词的拼法。
第三类：
twentieth (20th) 第二十
thirtieth (30th) 第三十
fortieth (40th) 第四十
fiftieth (50th) 第五十
sixtieth (60th) 第六十
seventieth (70th) 第七十
eightieth (80th) 第八十
ninetieth (90th) 第九十
这一类全是十位整数的序数词，共八个。它们的构成方法是：先将相应的十位整数的基数词词尾－ty中的y改成i，然后在加上后缀－eth。
第四类：
thirty-first (31th) 第三十一
sixty-second (62nd) 第六十二
eighty-seventh (87th) 第八十七
ninety-eighth (98th) 第九十八
这类表示“第几十几”的序数词，跟表示“几十几”的基数词一样简单。在构成方法上均由基数词“几十几”变化而来，十位数不变，仅把个位上的基数词变成序数词就行了。
1、序数词表示顺序，是第几的意思。
如：first(第一), second(第二), third(第三), fifth(第五), twelfth(第十二), twentieth(第二十)等。
2、序数词作主语，前面一般有定冠词。
The first is better than the second.
第一个比第二个好。
3、序数词作宾语，前面一般有定冠词。
I like the second on the left.
左边第二个。
Why not say the first on the right?
为什么不说右边第一个？
This is the first girl who fascinates me.
这是第一个迷住我的女孩。
He was among the first to arrive.
他是第一批到达的人。
4、序数词作主语补语时，前面可有可无定冠词。
She was (the) third in the exam.
她考试得了第三名。
5、序数词用作副词修饰动词时，不加冠词。
When did you first meet him?
你第一次见到他是什么时候?
6、序数词作同位语，前面须有定冠词。
Do you know the man, the second in the back row?
你认识后排第二个人吗?
7、序数词在句子中充当修饰语，前面通常加冠词。
They celebrated the fiftieth anniversary of winning theSecond World War.
他们庆祝二次世界大战胜利五十周年。
序数词重要用法
序数词用于表示事物的顺序，一般由与之相应的基数词加th构成(但有特殊形式需特别记忆)；序数词主要用作定语，前面一般要加定冠词(或物主代词)。
如：
Their second son is a doctor.
他们的二儿子是个博士。
The hundredth cave that George has discovered in his lifetime is near the Alps.
乔治一生中找到的第一百个山洞在阿尔卑斯山附近。
注：序数词前有时可用不定冠词，表示“每一，又一”。
如：
We’ll have to do it a second time. 我们将再做一遍。
基变序口诀
基变序，有规律
词尾加上th(fourth,sixth)
一、二、三，特殊例，
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) ；
ty将y改成i, th前面有个e。
若是碰到几十几，
前用基来后用序。
或记忆为：
一、二、三，特殊记，
词尾字母t,d,d ，
八加h,九减e,逢十改y为ie
f要把ve替，还有th莫忘记
实战演练
I. Choose the best answer
( )1. Please turn to ______.
A. Page 11 B. the 11 st page
C. page 11 D. page the 11 th
( )2. At night we can see ______ stars in the sky.
A. thousands and thousands of
B. thousand and thousands of
C. a thousand and thousands
D. thousand and thousand
( )3. There are some _____ in our classroom.
A. hundred of books
B. the hundreds of books
C. hundreds of books
D. hundred of book
( )4. I have been to the village _____
A. a hundred time
B. hundred times
C. hundreds of times
D. hundred of times
( )5. There are ____ students in our school.
A. four—hundred and forty—five
B. four hundred and forty—five
C. four hundreds and forty—five
D. four hundred and forty five
( )6. The teacher told me to go over _____ lessons.
A. thirst three
B. the three first
C. three the first
D. the first three
( )7. May is ____ of a year.
A. the fifth months
B. the fifth month
C. the five months
D. the five month
( )8. We live in ______.
A. the twenty-first century
B. the century twenty-one
C. century twenty-one
D. the century twenty-first
( )9. He said he was going to be free in _____
A. one and a half hour
B. one hour and half
C. one and half hours
D. an hour and a half
( )10. ---How many English books are there on the table?
---There is only _____English book on it.
A. a B. an C. one D. the
( )11. Mr Smith stayed in _____ last night.
A. Room 403 B. the Room 403
C. the 403 room D. 403 the room
( )12. The road is _____
A. two thousand and five hundred metres long
B. two thousands metres long
C. long one thousand five hundred metre
D. a thousand and five hundreds metres long
( )13. He joined the army on _____ of May 1980.
A. 1 st B. the 1 C. first D. the first
( )14. Is Sunday the ____ day of the week?
A. a B. one C. once D. first
( )15. March the _____ is Women’s Day.
A. eighth B. ninth C. tenth D. eight
( )16. September is the _____month of the year.
A. nineth B. ninth C. nine D. the twelveth
( )17. December the ____ is Christmas.
A. twenty-five B. twenty-fifth
C. twentieth-five D. twenty-five
( )18. Another way of saying Lesson 12 is ______
A. Lesson ten-two B. Lesson Ten-second
C. the Twelfth Lesson D. Twelfth lesson
II. Complete the sentences according to the numerals: (用past或 to的句型)
1.What time is it ? (8:30)
It’s ______________________
2. What is it ? (9:15)
It’s _______________________
3. What time is it ? (7;45)
It’s ________________________
4. What was the date ? (1893年1月226日)
It __________________________
III. Translate the following into English:
1. 电话号码8485308 ________________
2. 第六十四中学 ___________________
3. 成千上万的儿童 _________________
4. 两个月半 _______________________
5. 45路公共汽车 ___________________
6. 三分之一 _______________________
7. 五分之四 ________________________
8. 第501房间 _____________________
9. 第二层 ________________________
10. 第三次 ______________________
11. 第五册 _______________________
12. 两周半 ____________________
13. 他每天早上总是第一个到校。
_____________________________
14. 第三天早上玛丽没有迟到。
______________________________
15. 这本书我昨晚读了20页。
_______________________________.
16. 最近的医院离他们学校约4—5公里。
_______________________________
17. 在二十世纪三十年代 _______________
18. 中华路21号__________________
I. 选择题
1—5. AACCB 6—10. DBADC 11—15. DADDA 16—18. BBC
II. 完成句子：
1. It’s half past eight.
2. It’s a quarter past nine.
3. It’s a quarter to eight.
4. It was January twenty-sixth eighteen ninety-three.
III. 翻译短语和句子：
1. Telephone number/ Tel. No. eight four eight five three o eight
2. No. Sixty-four Middle School
3. thousands of children
4. half and two months/ two months and a half
5. No. 45 bus/ Bus 45
6. one third
7. four fifths
8. Room 501
9. the second floor
10. the third time
11. Book V
12. half and two weeks/ two weeks and a half
13. He is always the first to get to school every morning.
14. The third day Mary wasn’t late
15. I read so pages of the book yesterday evening.
16. The nearest hospital is about four to five kilometers from their school.
17. in the 1930s
18. 2 Zhonghua Road
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