语法知识——Numerals (数词)
表示“多少”和“第几”的词叫数词。数词分成两大类：基数词和序数词。表示“多少”的词叫基数词，如：one, hundred等；表示“第几”的词叫序数词，如：first, hundredth。
一、基数词
最基本的基数词如下，其他的数词都可以由这些词组成。
one (1) two (2) three (3) four (4) five (5) six (6) seven (7) eight (8) nine (9) ten (10) eleven (11) | twelve (12) thirteen (13) fourteen (14) fifteen (15) sixteen (16) seventeen (17) eighteen (18) nineteen (19) twenty (20) twenty-one (21) thirty (30) | forty (40) fifty (50) sixty (60) seventy (70) eighty (80) ninety (90) a hundred (100) a thousand (1,000) a million (1,000,000) a billion (1,000,000,000) |
二、序数词
序数词一般由基数词加-th构成，如：fourth, sixth, eleventh等。以-y结尾的基数词构成序数词时，先把-y变为-i，再加-eth，如：twentieth, fortieth, fiftieth等。还有一些序数词的构成变化不规则，如：
第一 first 第三 third 第五 fifth 第八 eighth | 第二 second 第九 ninth 第十二 twelfth
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在日常生活中，序数词常被简化，一般规律是：阿拉伯数字后加相应序数词的末尾两个字母。如：1st, 2nd, 3rd, 4th, 21st, 30th, 105th。
数词用法的规则如下：
1. 编号的事物可用序数词或基数词加名词表示。例如：
the Fourth Lesson — Lesson Four
2. 有些编号的事物常用基数词表示。例如：
Room 8013, Bus No. 3, Page 256, the No. 101 Middle School
3. 表示“年、月、日”时，“年”用基数词。
April 5th,1996
May 1st 1977
4. 表示“几点钟”时用基数词。例如：
five (o’clock), five past three, twenty to nine
视频讲解：
Grammar Tips / Exercises
A. Translate the following Chinese phrases into English.
1. 301号房间 Room 301 (three o one)
2. 第八中学 the No. 8 Middle School
3. 第12课 lesson twelve / the twelfth lesson
4. 33路公共汽车 Bus No. 33 / the No. 33 Bus
5. 14:15 a quarter past fourteen / fourteen fifteen
B. Choose the best answer.
1. 265 is ________.
A. two hundreds and sixty-five
B. two hundred and sixty-five
C. two and sixty-five
D. two hundreds sixty five
2. He has been here for ________.
A. one and a half months
B. one and the half months
C. one and a half month
D. one and a half of month
3. In her ________ she began to take up writing.
A. forties
B. fourties
C. fortieth
D. fourtieth
4. ________ Summer Olympics was held in Barcelona in Spain.
A. The Twenty-four
B. Twenty-four
C. The Twenty-fourth
D. Twenty-fourth
5. ________ of the rivers here have been polluted.
A. Two-third
B. Two-thirds
C. Two-three
D. Second-third
Practical Reading and Writing
文档资料：
范例讲解：
Gift Notes (礼品卡留言)
西方人在赠送礼物的时候，一般会在礼物上附带一张留言卡片。留言卡上的内容把你的祝福与礼品一起传递给对方，加深礼品的意义。下面是几张礼品卡，请注意留言的格式以及各自不同的情景。
Tips for writing a gift note：
1. 内容通常包括：受赠人的姓名、赠送者的留言和姓名。
2. 明确送礼物的目的。
3. 语言要直率、简练，满怀真情实感。
讲解视频：
写作练习：
Write two gift notes
1. Write a note for an elderly person for his / her birthday gift.
2. Suppose you have bought a small gift for one of your classmates. Write a gift note to suit the special occasion. Try to make your note as interesting as possible to impress the person who will receive it.
