Unit 6 Trees Grammar：数词（同步课件）英语新教材沪教版五四学制七年级下册

语法单元 Unit6 Trees 教师______ 学校______ 数词 考点一　数词的分类 英语中，数词包括基数词与序数词两大类。 基数词：表示从1数到N。 one， two， three， ... 序数词：表示第N个(表顺序)，由基数词转变而来。 考点二　基数词的表示法 示例 1～12单独记 one， two， three， four， five， six， seven， eight， nine， ten， eleven， twelve 13～19词尾为后缀­teen thirteen， fourteen， fifteen， sixteen， seventeen， eighteen， nineteen 20～90逢十词尾为后缀­ty twenty， thirty， forty， fifty， sixty， seventy， eighty， ninety 示例 21～99(除逢十词外)在十位 数和个位数之间加连字符 构成 twenty­nine， thirty­eight， forty­seven， fifty­six， sixty­five， seventy­four， eighty­three， ninety­two 单位词 hundred， thousand， million， billion 【巧记口诀】找清规律很容易，十二以内词各异；十三数到十九去，后加-teen莫忘记； 二十、三十至九十，整十之后有-ty；如果要说“几十几”，中间“-”号别丢弃； hundred是“一百”，请你记住莫大意。 1.时间的表达 a.顺读法:小时+分钟 six ten（6:10） b.逆读法:先读分钟后读小时 1）当分钟数小于30分时,一般用past,格式为:小时+past+分钟。 如:3:30的读法为three thirty/half past three 2）当分钟数大于30分时,一般用to,格式为:（60-分钟）+to+（小时+1）。 如:10:45的读法为fifteen to eleven c.半小时用 half ,15分钟用 quarter 如:3：15可读作a quarter past three, 9:30可读作half past nine 考点三　基数词的用法 9 2.数量、倍数和度量单位的表达 a.倍数的表达:三倍及以上用“基数词+times”。如：five times（五倍） b.度量单位的表达:“数字+表示量的名词+形容词”。如：9 meters deep （9米深） 3.价格的表达 基数词+金钱单位:100 dollars 10 4.年龄的表达 a.基数词（+years old）或at the age of+基数词:ten（years old）=at the age of ten 如:Tom is five（years old）. 汤姆五岁了。 Tom could play the piano at the age of five. Tom 5岁会弹钢琴。 b.基数词 -year-old:15-year-old 如：Teng Fei is a fifteen-year-old boy.滕飞是个15岁的男孩。 5.表示百分数,用基数词。如:80% eighty per cent 33% thirty-three per cent 6.表示小数,用基数词。如:0.24（zero） point two four 10.75 ten point seven five 11 7.表示电话号码,用基数词。如:8370 9295 eight three seven o, nine two nine five 8.“基数词+名词”构成的复合形容词,该名词用单数形式。 如:a seven-day holiday, an 8-metre-long stick 12 基数词变序数词，词尾加上-th(fourth，sixth)；注意第一、二、三、五、八、九、十二的序数词分别为：first，second，third，fifth，eighth，ninth，twelfth；以y结尾的基数词变序数词，y变ie后加-th(twentieth)；若是碰到第几十几，前面用基数词，后面用序数词，中间加个连字符，如twenty-first。 考点四　序数词的构成 【巧记口诀】一，二，三要全变(one-first；two-second；three-third)； 其余都加th，th里有例外，8去t(eight-eighth)，9去e(nine-ninth)； 字母f代ve(five-fifth；twelve-twelfth)；ty变成tie(twenty-twentieth)； 若要变化几十几，只变个位就可以(twenty-one-twenty-first)。 类别 用法 示例 表示顺序 序数词前通常加the,其后接单数名词 the first lesson第一课 Our classroom is on the second floor of Building 2.我们的教室在2号楼的二楼。 表示日期 日期用“the+序数词”表示 National Day is on the 1st of October.国庆节是10月1日。 May 5五月五日(读作May the fifth或the fifth of May) Mar. 1(st) 三月一日(读作March the first或the first of March) 表示世纪 世纪可以用“the+序数词+century”表示 in the sixth(6th)century在6世纪 in the eighteenth(18th)century在18世纪 考点五　序数词的用法 注意     1.序数词前有形容词性物主代词或名词所有格限定时,不再加定冠词。例: Tomorrow will be my brother's ninth birthday. 明天将是我弟弟的九岁生日。 2.a/an+序数词,表示“又一,再一”。例: We'll go over it a second time. 我们会再仔细检查一遍。 We've tried it three times. Must we try it a fourth time?我们尝试过三次了,还必须再尝试一次吗? 3.序数词还可以作副词,表示“第几名”。例:Who came first in the race?赛跑谁第一? 4.表示某人第几次做某事,可用结构“It/This is the first/second/...time(that) sb. have done sth.”。例: This is the first time (that) I've been to London. 这是我第一次去伦敦。 1. 分数的表达法 (难点) 分子基,分母序;分子大于1,分母变复数。 1/3 one third, 2/3 two thirds,3/5 three fifths 特别记住:1/4 a quarter/one fourth, 3/4 three quarters/three fourths。 2.小数的表达法 小数点读作point, 其左边的整数按基数词的读法,其右边按照数字本身逐个读出。 0.38 zero point three eight 96.89 ninety-six point eight nine 107.509 one hundred and seven point five o/zero nine 考点六　分数和小数的表达 9:00 nine o'clock 7:22 ten to eleven 8:45 a quarter to nine 10:50 half past eleven 11:30 twenty-two past seven 1. 将下列时间与其对应英语表达连线。 2.读英文，写时间。 (1)five past ten ________ (2)a quarter past eleven ________ (3)five to eleven ________ (4)ten to nine ________ (5)half past seven ________ 10:05 11:05 10:55 8:50 7:30 ►再提能力——小语篇训练(语法选择) Everybody in China knows Qin Shihuang.He is known as the __3__ emperor of China during the Qin Dynasty.He was born in Hebei in the late Eastern Zhou Dynasty.When he grew up, he became the king of the state of Qin.He spent ten years beating the other __4__ states and united(统一) China for the first time. (　　)3.A.second　　 B．first　　　 C．one (　　)4.A.six　　　　 B．sixth　　 C．the six B A ►再提能力——小语篇训练(语法选择) Dear Anne， How are you? I had great fun last Monday, __5__．It was the Dragon Boat Festival that day.This festival is in memory of Qu Yuan, one of the greatest Chinese poets.He killed himself by jumping into the Miluo River on __6__ of May of the lunar calendar, 278 BC.From then on, every year on this day, people celebrate the festival to memorize Qu Yuan. (　　)5.A.June 3, 2022　B．2022, June 3　C．2022, 3 June (　　)6.A.the five　　　 B．fifth　　　　 C．the fifth A C 短文填空(主要考查数词) 　 We should recycle tires (轮胎) because they are not biodegradable (可生物降解的).Not only is this bad for the environment，but it also causes many other problems. 　 7.　　　　　　 (hundred) of millions of old tires are recycled each year in the United States.Some are reused to make new products，and some are reused at home for creative projects.But why do we need to recycle them instead of just throwing them away？ Hundreds 　 The 8.　　 (one)reason is that tires are not biodegradable.Tires can take hundreds or 9.　　　　　　 (thousand ) of years to decompose (分解).If you throw them in nature，they will do harm to the environment. 　 The 10.　　　　 (two) reason is that tires take up a lot of space in landfills.In addition，tires get into landfills and attract insects and pests (害虫).This may cause many diseases. first thousands second see you again $$