情景导入
放学后，同学们悄悄在教室布置气球和蛋糕——今天是班长的生日！大家齐声唱起 "Happy birthday to you!"，然后有人问她：When is your birthday? — It's on October 12th.
回答这个问题需要两样"零件"：月份（October）和序数词（12th, twelfth）。中文说"10 月 12 日"用基数词就行，英语却要说"第十二天"——这是本单元最大的新知识。学会了它，你还能聊学校的运动会、艺术节等各种日期。
核心词汇
十二个月份：
| 月份 | 缩写 | 月份 | 缩写 |
|---|---|---|---|
| January 一月 | Jan. | July 七月 | Jul. |
| February 二月 | Feb. | August 八月 | Aug. |
| March 三月 | Mar. | September 九月 | Sept. |
| April 四月 | Apr. | October 十月 | Oct. |
| May 五月 | May | November 十一月 | Nov. |
| June 六月 | Jun. | December 十二月 | Dec. |
序数词要点：first（1st）、second（2nd）、third（3rd）特殊记；fifth（5th）、ninth（9th）、twelfth（12th）、twentieth（20th）拼写易错；twenty-first（21st）只变个位。生日相关：party（聚会）、cake（蛋糕）、gift / present（礼物）、candle（蜡烛）、card（贺卡）、celebrate（庆祝）
句型与语法
核心句型：问生日、答日期
- When is your birthday? — My birthday is on May 2nd. / When is his birthday? — It's on December 21st.
日期的写与读：写 October 12th 或 October 12；读 October the twelfth（月 + the + 序数词）。
序数词构成三步法：
- 基数词 + th：four → fourth，six → sixth
- 特殊变化背口诀："一二三，特殊记（first, second, third）；五、九、十二仔细看（fifth, ninth, twelfth）；ty 结尾 y 变 ie（twenty → twentieth）"
- 几十几只变个位：thirty-first（31st）
年龄的问答：How old are you? — I'm thirteen.（年龄用基数词）但"13 岁生日"是 the thirteenth birthday（第几个生日用序数词）。
日期介词：具体某一天用 on → on June 1st, on my birthday；只说月份用 in → in June.
听说训练
生日大调查（问三位同学并记在表格里）：
- A: When is your birthday? — B: It's on August 8th.
- A: How old are you? — B: I'm thirteen.
- A: Do you want to have a birthday party? — B: Yes! Let's have it by the West Lake!
辨析对比
① 基数词 vs 序数词
- 数量、年龄用基数词（three cakes, I'm thirteen.）；日期、名次用序数词（June third, the first prize）。生日在 5 月 2 日是 on May 2nd，不是 on May two ❌。
② on / in 与日期：on + 具体某天（on October 12th, on Children's Day）；in + 月份/年份（in October, in 2026）。有"日"用 on，只有"月/年"用 in。
③ How old vs When：How old 问年龄（— She's twelve.）；When 问时间/日期（— It's on July 6th.）。两个问句常连环出现，看清问的是"几岁"还是"哪天"。
文化角
英美的生日派对上，寿星要许愿并一口气吹灭蜡烛，愿望说出来就"不灵"了；朋友送礼物时，寿星通常当面拆开并大声道谢。日期书写也有差异：英式 12/10/2026 是"日/月/年"，美式 10/12/2026 是"月/日/年"，最稳妥的写法是 October 12th, 2026。
易错点
- 日期用基数词：My birthday is on May two. ❌ → on May 2nd（second） ✅
- 序数词拼写：nineth ❌ → ninth ✅；twelveth ❌ → twelfth ✅；twentyth ❌ → twentieth ✅
- 介词 in/on 混用：My birthday is in June 1st. ❌ → on June 1st ✅
- 月份首字母小写：in october ❌ → in October ✅（月份必须大写）
中考真题
— When is the school art festival this year? — It's ______ October 21st, two days after my ______ birthday.
A. in; thirteen B. on; thirteenth C. on; thirteen D. in; thirteenth
✏️ 点击查看解答
答案：B
解析：第一空：October 21st 是具体的某一天，日期前用介词 on（只说月份才用 in），排除 A、D；第二空：my ______ birthday 意为"我的第十三个生日"，表示"第几个"必须用序数词 thirteenth，排除 C。因此选 B。
考点
- 序数词的构成与拼写（first/second/third、fifth、ninth、twelfth、twentieth）是七上重点，单词拼写题常客；
- 日期介词 on（具体某天）与 in（月/年）的区分是高频单选考点，When / How old 两类问句与答语的匹配是听力必考；
- 书面表达：生日派对邀请函是本单元特色题型，"时间 + 地点 + 活动 + Welcome!"四要素缺一不可。
诵读 Read Aloud
Part 1 · 对话：筹备生日会（分角色朗读）
A: Hi, Lily! When is your birthday? — B: It's on October 12th. It's coming soon!
A: Wow! How old will you be? — B: Thirteen. My parents want to have a party in a tea house near the West Lake. We can eat cake and drink Longjing tea there.
A: Sounds wonderful! Happy birthday in advance! — B: Thank you! Welcome to my party!
Part 2 · 短文：My Thirteenth Birthday（生日范文）
My name is Lily, and my birthday is on October 12th. This year is special, because it is my thirteenth birthday. My family have a party for me in a tea house near the West Lake in Hangzhou. My friends come at two o'clock in the afternoon. On the table, there is a big cake with thirteen candles. I make a wish and blow out all the candles. My best friend gives me a card, and it says, "Happy birthday! Wish you happy every day!" We sing, play games and take photos by the lake. What a happy day!
诵读小贴士：Part 2 里藏着日期（on October 12th）、序数词（thirteenth）、基数词（thirteen candles）三类数字表达，边读边分类圈出来，考试就不会再混淆。