Unit2语法专项课件-基数词与序数词-2025-2026学年沪教版英语八年级上册

教学课件 沪教（牛津）英语八年级上册 Unit 2语法专项—— 基数词与序数词 全解精讲+分层练习 1 学习目标 1.掌握基数词1–1000+的拼写与读法规则。 2.牢记序数词特殊变化与通用拼写规律。 3.区分基数词表数量、序数词表顺序的用法。 4.掌握概数与确数的用法：hundreds of / two hundred。 5.熟练完成填空、单选、句型转换等题型。 基数词—定义 基数词表示数量、计数。 回答：How many…? 结构：描述人或事物的总数。 例句：There are four seasons in a year. 例句：I have three hundred books. 基数词—1–12 1–12 为独立单词，必须逐个记忆。 1 one 2 two 3 three 4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten 11 eleven 12 twelve 用法：最基础计数，无规律。 基数词—13–19 13–19 以 -teen 结尾。 13 thirteen 14 fourteen 15 fifteen 16 sixteen 17 seventeen 18 eighteen 19 nineteen 注意：thirteen, fifteen 拼写特殊。 基数词—20–90整十 20–90 整十数以 -ty 结尾。 20 twenty 30 thirty 40 forty 50 fifty 60 sixty 70 seventy 80 eighty 90 ninety 注意：forty, fifty 拼写特殊。 基数词—21–99 几十几：十位与个位之间加连字符 -。 结构：整十 + 连字符 + 个位。 21 twenty-one 36 thirty-six 99 ninety-nine 例句：He is twenty-two years old. 基数词—100及以上 百位与十位之间加 and。 结构：…hundred + and + … 365 three hundred and sixty-five 1200 one thousand two hundred 确数：前有数字，不加s。 基数词—确数 vs 概数 确数：具体数字 + hundred / thousand / million 不加s，不加of two hundred people ✔️ 概数：复数 + of，表模糊数量 hundreds of / thousands of ✔️ 基数词用法总结 1.表数量：five pens 2.表年龄：ten years old 3.表年份：1996 nineteen ninety-six 4.确数不加s；概数加s加of 5.大数：百位十位加and 序数词—定义 序数词表示顺序、排名、第几。 回答：Which…? 常与 the 连用。 例句：Sunday is the first day of a week. 例句：He lives on the third floor. 序数词—特殊变化 1 one → first (1st) 2 two → second (2nd)3 three → third (3rd) 这三个无规律，必须特殊记忆。 序数词—通用规则（4–19） 4–19 一般加 -th。 特殊变化：8 eight → eighth（去t）9 nine → ninth（去e）5 five → fifth 12 twelve → twelfth（ve→f） 序数词—整十变化 整十词：ty → tie + th 20 twenty → twentieth 30 thirty → thirtieth 40 forty → fortieth 50 fifty → fiftieth 序数词—几十几变化 几十几：前基后序,只把个位变为序数词。 21 twenty-one → twenty-first 99 ninety-nine → ninety-ninth 序数词—用法规则1 一般情况：序数词前加 the the first lesson/ the second floor/the fifth month 例句：January is the first month. 序数词—用法规则2 前面有物主代词（my/his/her），不加the。例: my first time/her third bag 例句：This is my first visit to Beijing. 序数词—用法规则3 表示“再一、又一”：a/an + 序数词 a second cake another try/a third time 例句：Can I have a second try? 序数词—用法规则4 表示比赛、排名：不加the be first be second/get third prize 例句：He is first in the running race. 基数词基础练习1 1.__________ (5) birds are flying in the sky. 2.He is __________ (19) years old. 3.There are _______________ (21) students in my class. 4._________________ (100) years is a century. 5.There are _________________________ (365) days in a year. 6.__________________ (成千上万) people visit the park. 7.The number is _______________________________ (429). 8.He was born in ________________________ (2010). Five nineteen twenty-one One hundred three hundred and sixty-five Thousands of four hundred and twenty-nine two thousand and ten 序数词基础练习 写出正确序数词 1.one → _____________ 2.two → _____________ 3.three → _____________ 4.five → _____________ 5.twelve → _____________ 6.twenty → __________ 7.thirty → _____________ 8.twenty-one → __________ 9.nine → _____________ 10.eight → _____________ first second third fifth twelfth twentieth thirtieth twenty-first ninth eighth 易混点总结1 确数：two hundred ✔️ two hundreds ❌ 概数：hundreds of ✔️ 日期/楼层：用序数词 May the third/ the second floor 易混点总结2 the + 序数词 my/his + 序数词（不加the） a + 序数词（再一） 几十几：只变个位为序数词 单项选择 1.There are __________ months in a year. A. twelve B. twelfth C. the twelve 2.December is the __________ month. A. twelve B. twelfth C. twelveth 3.Please turn to the __________ page. A. twenty B. twentieth C. twentyth 4.There are __________ stars in the sky. A. millions B. millions of C. million of A B B B 5.This is my __________ time to visit the museum. A. first B. the first C. one 6.He lives on the __________ floor. A. three B. third C. thirteen 7.The Yellow River is the __________ longest river in China. A. two B. second C. twice 8.Can I have __________ cake? A. a second B. second C. two A B B A 句型转换 1.I have three books.（对划线提问） __________ __________ books do you have? 2.He lives on the fourth floor.（对划线提问） __________ __________ does he live on? 3.This is my first time to be here.（同义句） This is the __________ time for __________ to be here. 4.I have two hundred stamps.（否定句） I __________ have two hundred stamps. How many Which floor first me don’t 课堂总结（一） 基数词：表数量。 1–12特殊；13–19 -teen；20–90 -ty。 确数不加s；概数s+of。年份、年龄、数字均用基数词。 课堂总结（二） 序数词：表顺序。 1/2/3特殊；4+加th；ve→f；ty→tie。 前加the；有物主代词不加the； a+序数词表“再一”。日期、楼层、排名用序数词。 教学课件 Unit 2语法专项—— 基数词与序数词 Thank you for listening! 23 $