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课件网) Unit 2 Amazing numbers Grammar 语法优质课 沪教版（2024）八年级 上 Learning objectives 1 Lead in Presentation 3 Practice Talking 5 Summary Assessment 7 Homework 2 4 6 8 By the end of the lesson, I will be able to... 1 2 3 know cardinal numbers and their usages; know ordinal numbers and their usages; talk about the longest or highest things. 01 Learning objectives https://www.21cnjy.com二一教育 02 Lead in Lead in 02 Peter came to numbers kingdom.He wants to know more about the numbers. Cardinal numbers Presentation 03 We use cardinal numbers to count things. Cardinal numbers 0～12为基本单词： zero one two three four five six seven eight nine ten eleven twelve Presentation 03 13～19为对应的个位数单词（或变形）后加-teen： thirteen fourteen fifteen sixteen seventeen eighteen nineteen 20～90为其对应个位数单词（或变形）后加-ty： twenty thirty forty fifty sixty seventy eighty ninety 26 twenty-six 98 ninety-eight 21～99的非整十基数词要在十位数和个位数之间加连字符“-”： 03 Presentation 101～999的三位数，百位数和十位数（若无十位数则和个位数）之间用and连接，百后用单数形式： 105 a/one hundred and five 999 nine hundred and ninety-nine 在记录1000以上数字时，通常用逗号或空格将其隔开，从各位开始，每三个数字为一组。从右向左，第一组前用thousand,第二组前用million,第三组前用billion： 2,673 two thousand six hundred and seventy-three 5,204,000,000 five billion two hundred and four million 03 Presentation When we read out numbers, we do not add -s to the words hundred, _____, _____, and _____. We put _____ between hundred and ten. thousand million billion and 03 Presentation 当hundred, thousand, million前有确切的数字时，不能使用复数形式,也不能加of；当表示不确切数字，如成百、成千上万、数以百万计等时，则用复数形式+of表示。 There are hundreds of students on the playground． 操场上有好几百名学生 Dinosaurs lived on Earth for millions of years. 恐龙在地球上生存了数百万年 03 Presentation 基数词的用法 1.表示数量：three apples (三个苹果)。 2.表示时刻、年份、年代：nine o’clock (九点钟)；in two thousand and twenty (在2020年)；in the 1930s (在20世纪30年代)。 3.表示年龄：He is ten (years old). (他十岁了)；in one’s thirties (在某人三十几岁时)。 4.表示事物编号：Room 105(105房间)；Lesson Six (第六课) 5.数学运算：Two and three is five. (二加三等于五)。 03 Presentation 3rd 4th Ordinal numbers We use ordinal numbers to show the order of things. 03 Presentation 试着写出表格里数字的序数词并找出规律 03 Presentation ★序数词的构成 ①1，2，3 是序数词中变化最特别的几个数字：first, second, third。 ②序数词 4-19 在相应基数词词尾加 _____ 构成，例如： six-sixth, thirteen-thirteenth； 序数词 5,8,9,12 需要特殊记忆 ： five-fifth，eight-eighth，nine-ninth，twelve-twelfth。 -th 03 Presentation ③20-99 之间的整十位数在构成序数词时，将相应基数词词尾 -y 变成 -i， 再加 -eth。例如：twentieth (第 20), sixtieth (第 60)。其余个位数不为零的十位数在构成序数词时，十位数用基数词表示，个位数用_____ 表示。如：twenty-third (第 23)，thirty-seventh (第 ... ...
