2018中考精品英语专题—数词.pptx

专题4： 数词;数词就是表示事物的数量和顺序的词,分为基数词和序数词两种。;一. 基数词;(1)1-12分别由从one到twelve12个各不相同的词表示。;;;百位和十位(若无十位则和个位)之间用and连接,十位和个位间用“-” 连接。156 one hundred and fifty-six;810 eight hundred and ten 204 two hundred and four;;;;;1. — If a = 3, b=4, what’s the answer to the problem, a+2ab+1=?— The answer is ___. A. twenty eight B. twenty-eighth C. twenty-eight2. In our school several __ students are able to search the Internet. A. hundred of B. hundreds of C. hundreds;3. Many ___ sheep were killed in the accident. A. thousands of B. thousand C. thousands 4. There are over nine ___ workers in the factory, but ___ of young people hope to work in it. A. hundred; hundreds B. hundreds; hundreds C. hundreds; hundred;二. 序数词;序数词;11 = eleven 11th = eleventh 12 = twelve 12th = twelfth 13 = thirteen 13th = thirteenth 14 = fourteen 14th =fourteenth 15 = fifteen 15th = fifteenth 16 = sixteen 16th =sixteenth 17 = seventeen 17th = seventeenth 18 = eighteen 18th =eighteenth 19 = nineteen 19th =nineteenth 20 = twenty 20th = twentieth 21 = twenty-one 21st = twenty-first 22 = twenty-two 22nd = twenty-second;(1).序数词除了first (第一)、second (第二)、third (第三) 特殊外,其余的都是在基数词上加词尾-th构成。 注意fifth, eighth, ninth, twelfth这几个词。;(2)从第二十至第九十以-ty 结尾的表示“几十”的基数词(十位整数的序数词) ,先变y为ie,再加“-th”构成。twenty?twentieth; thirty?thirtiethforty fifty sixty seventy eighty ninety ;(3)表示“第几十几”时，十位数的“几十”仍用基数词，只把处位部分变成序数词。;(5)序数词的缩写形式有时, 序数词可以用缩写形式来表示。序数词的缩写形式, 由阿拉伯数字加序数词的最后两个字母构成。主要缩写形式有。 first—1st; second—2nd; third—3rd; fourth—4th; sixth—6th; twentieth—20th; twenty-third—23rd;注: 序数词前通常要加定冠词 the。;Two days isn’t enough for me to finish the work. I need ____ day. (宁波市鄞yin州)A. a third B. the third C. the other D. other;In order to