译林版（2024）七年级英语下册期中复习讲义 基数词与序数词（房间号、楼层、日期表达）含答案

这是一份译林版（2024）七年级英语下册期中复习讲义 基数词与序数词（房间号、楼层、日期表达）含答案，共19页。学案主要包含了基数词核心用法 & 构成规律，序数词——顺序与日期关键，重点应用场景，易错陷阱 & 解题技巧等内容，欢迎下载使用。

本考点为译林版七年级下册Unit 1《Dream hmes》核心基础，也是期中考试的必考点。基数词表示数量或编号，序数词表示顺序、日期、楼层等。熟练掌握其构成、特殊变化及实际运用场景，对听力、单选、填空及写作都有直接帮助。下面从基础规则到高阶应用，层层递进，结合最新考试题型精准突破。
一、基数词核心用法 & 构成规律
基数词（ne, tw, three…）主要用来表达数量、年龄、电话号码、房间号、时间等。1-12独立记忆，13-19以-teen结尾，20-90整十以-ty结尾。几十几用连字符“-”，如twenty-ne。百位后通常加and（英式英语常用），如365 → three hundred and sixty-five。千位以上用逗号分隔，如5,678 → five thusand six hundred and seventy-eight。
二、序数词——顺序与日期关键
序数词用于表示顺序（第一、第二……）、楼层、生日、纪念日等。绝大多数序数词由“基数词+th”构成，但需注意特殊变化：first, secnd, third, fifth, eighth, ninth, twelfth。整十的序数词变y为ie再加th：twenty→twentieth，thirty→thirtieth。两位数序数词只变个位：twenty-first (21st), ninety-ninth (99th)。
记忆口诀：
一二三，特殊记，first, secnd, third要牢记；
八去t，九去e，ve要用f替；
整十改y为ie，再加th莫迟疑；
若是遇到几十几，只变个位就可以。
三、重点应用场景（考试高频）
1. 楼层表达： 英式英语中 grund flr为一楼，first flr为二楼；但美式英语和中国教材常采用美式：first flr 一楼，secnd flr 二楼。译林版教材按英美混合实际，常考“n the ... flr”结构，基数词变序数词。如：My classrm is n the third flr. (三楼)
2. 房间号/编号： 用基数词，且每个数字单独读，大写字母+数字。Rm 302 → Rm three zer tw / three tw。Page 105 → Page ne zer five。
3. 日期表达： “月+日” 日用序数词（可省略the），如 March 12th (读作March the twelfth)；“日+月” 则必须用序数词，如12th March。
4. 年龄/时刻： at the age f thirteen; 6:15 → six fifteen (或 a quarter past six)。
四、易错陷阱 & 解题技巧
⚠️ 陷阱1：hundred, thusand, millin 前有具体数字时不能加s，且不加f；表“数百”用 hundreds f。
⚠️ 陷阱2：序数词前通常加 the，但物主代词或名词所有格后不加 the：my first day, Tm's secnd car.
⚠️ 陷阱3：日期书写 “May 1st” 或 “1st May” 都正确，但考试听力中注意读法。
⚠️ 陷阱4：第几十几的拼写：frty-secnd (42nd)，注意 frty 无u。
典型例题·名师精析（匹配期中题型）
例1 (语法填空) — Hw many students are there in yur class? — ________ (furty) students. 答案：frty (注意正确拼写) [2分]
例2 (单词适当形式) Tday is her ________ (twelve) birthday. She is very happy. 答案：twelfth (序数词) [2分]
例3 (单项选择) My uncle lives n the ________ flr. He uses a lift every day. A. nine B. ninth C. nineth D. the nine 答案：B[2分]
例4 (句子翻译) 我们学校图书馆在第五层。______________________________________ 答案：Our schl library is n the fifth flr.
例5 (情景交际) — Excuse me, which rm? — Rm ________. A. 406 B. fur zer six C. fur hundred and six D. fur six (多选可能但常见正确读法B/D) 答案：B/D (数字逐一读)
实战综合演练（总分36分 · 紧扣期中卷型）
Part A 根据句意及提示填空（每题2分，共12分）
1. There are ________ (四十) teachers in ur schl, and twenty f them are wmen.
2. December is the ________ (twelve) mnth f the year.
3. My cusin will have his ________ (furteen) birthday next Sunday.
4. Tm lives n the ________ (nine) flr. It's a tall building.
5. The ld man is ________ (九十) years ld, but he is very healthy.
6. There are tw ________ (hundred) bks in the new library.
Part B 单项选择（每题2分，共12分）
1. —Hw d yu say “305” in English? —It's ________.
A. three hundred and five B. three hundred five C. three zer five D. three five
2. My birthday is n June ________.
A. tw B. secnd C. the tw D. the secnd
3. —Which flr d yu live n? —I live n the ________ flr, and there are 20 flrs in ttal.
A. twentieth B. twenty C. twentyth D. the twentieth
4. Please turn t Page ________ and lk at the ________ picture.
A. fifteen; five B. fifteen; fifth C. fifteenth; fifth D. fifteenth; five
5. There are ________ students in the sprts meeting. Abut tw ________ are frm ur schl.
A. hundred f; hundreds B. hundreds f; hundred C. hundreds f; hundreds D. hundred; hundred
6. The Reading Festival is n ________ f Octber.
A. twenty-tw B. 22nd C. the twenty-tw D. twenty secnd
Part C 根据中文完成句子（每题2分，共6分）
1. 我们班有五十三个学生。________________________________________
2. 你住在第几层？我住在第十二层。________________________________________
3. 9月10日是教师节。________________________________________
Part D 语篇型填空（共6分）
阅读下面短文，根据上下文在空白处填入适当的基数词或序数词。
My dream hme is nt very big. It has three flrs. On the ______ (1) flr, there is a large living rm and a kitchen. On the ______ (2) flr, there are tw bedrms. I live n the ______ (3) flr because I like a quiet place. My birthday is n the ______ (4) f March. This year I will be ______ (5) years ld (十四). I will invite ______ (6) friends t my party.
考点1 总结与高分锦囊
① 牢记序数词特殊变化（first, secnd, third, fifth, eighth, ninth, twelfth）；② 楼层/日期用序数词，房间/页码用基数词；③ hundred/thusand 无具体数字加s和f，有具体数字保持单数；④ 注意 “几十几” 的连字符及序数词只变个位。本考点在期中考试中通常占6-10分，题型多为填空、单选、句型转换和听力日期题。建议多读多背不规则序数词表，并动手默写1-100序数词。

参考答案及解析
Part A 填空
1. frty (注意拼写) 2. twelfth 3. furteenth 4. ninth 5. ninety 6. hundred (tw hundred固定搭配无s)
Part B 单选
1. A (数字读法，305在数学读法中常用three hundred and five) 2. D (June 2nd，日期用序数缩写) 3. A (第二十层 twentieth) 4. B (Page fifteen第十五页；第五幅图 fifth) 5. B (hundreds f 数百个；tw hundred 两百) 6. B (10月22日：22nd)
Part C 句子翻译
1. There are fifty-three students in ur class. / Our class has fifty-three students.
2. Which flr d yu live n? I live n the twelfth flr.
3. September 10th is Teachers' Day. / Teachers' Day is n September 10th.
Part D 语篇填空
(1) first (2) secnd (3) third (4) twelfth (5) furteen (6) furteen 或 a few 基数词均可。答案示例: first, secnd, third, twelfth, furteen, furteen(或six)
典型例题答案：
例1 frty 例2 twelfth 例3 B 例4 Our schl library is n the fifth flr. 例5 B/D
※ 总分值: 典型例题(8分) + 实战演练(36分) = 44分，建议学生限时25分钟完成，教师批阅可灵活给分。分类
示例
注意点
1-12
ne, tw, three, fur, five, six, seven, eight, nine, ten, eleven, twelve
特殊拼写：eleven/twelve
13-19
thirteen, furteen, fifteen, sixteen, seventeen, eighteen, nineteen
thirteen, fifteen, eighteen 变形
20-90整十
twenty, thirty, frty, fifty, sixty, seventy, eighty, ninety
注意frty无u，eighty一个t
21-99非整十
twenty-ne, thirty-tw, ninety-nine
连字符不可省略
100以上
ne hundred, tw hundred and five
hundred不加s（有具体数时）
基数词
序数词
缩写
常见用法
ne
first
1st
the first flr (一楼)
tw
secnd
2nd
the secnd lessn
three
third
3rd
the third mnth
five
fifth
5th
May 5th
eight
eighth
8th
eighth nte
nine
ninth
9th
ninth flr
twelve
twelfth
12th
twelfth birthday
twenty-ne
twenty-first
21st
21st century