资源简介 (共18张PPT)中考英语之数词专项知识导图知识点梳理知识点1概念数词是指表示数目多少或顺序先后的词。表示数目多少的数词叫___________,如 one, five, ten, thirty, sixty-five 等;表示顺序先后的数词叫____________,如 first, sixth, tenth, twenty-first 等。基数词序数词知识点2构成1.基数词(1) 1-12的基数词是:one, two,……………….ten, eleven, twelve.(2) 13-19的基数词:分别在3-9的基数词后加词缀-teen,但要注意几个特殊变化的基数词:13-__________,15-_________, 18-____________(3) 20-90基数词: 20-________,30-________,40-________,50-______,60-sixty,70-seventy,80-eighty,90-ninety(4) 21-29的基数词: 21-twenty-one,22-twenty-two,23-twenty-three,24-twenty-four,25-twenty-fivethirteenfifteeneighteentwentythirtyfortyfifty知识点2构成2.序数词(1) 1-19的序数词除了第一(first),第二(second)和第三(third)之外,其他的序数词是由基数词加后缀-th构成的。例如:第四 -fourth,第六-sixth,第七-seventh等。注意几个序数词的特殊变化:fifth 第五,eighth 第八,ninth 第九,twelfth 第十二。(2) 两位数的序数词如果包含1-9的个位数,十位数用基数词,个位数用序数词。例如:第21-twenty-first,第34-thirty-fourth。例如:1978年3月18日:__________________________________March 18th, 1978巧记口决基变序,有规律,结尾加上?th;一二三,特殊记,结尾字母t,d,d;八去t,九去e,f来把ve替;ty将y变ie,后加?th别忘记;要是遇到几十几,只变个位就可以。知识点3用法1.定冠词the和序数词连用表示顺序。(第几) 例如:the second2.分数表示法:分子基数词,分母用序数词,除了分子是“1”的情况外,分母的序数词都要用复数。one third: 1/3; two thirds______ ; a (one) quarter 或one fourth:1/4分子 基数词分母 序数词one fifth分子 ﹥ 1分母 + stwo sevenths分子 a分母 quartera quarterthree quartersa halfthree and one third基数词 + and + 分数2/3知识点3用法3.年、月、日、时的表示法① 月日年 在1998年10月1日on August the ninthin May, two thousand and tenon Octorber the first, nineteen ninety-eight日the + 序数词月(首字母大写)月日与年之间用,分开年(两位两位读)on Oct. 1st ,1998② 月日 在8月9日③ 月年 在2010年5月知识点3用法4.钟点的表示:小时、点钟、分钟、秒钟要用基数词。(1)“几点过几分,≤30分钟”用介词past。如:7:05—five past seven;7:15—fifteen(a quar- ter)past seven; 7:30—half past seven。(2)“差几分几点”用介词“to”。注意:整点加“1”且用 60 减去目 前的分钟数。如:7:40—twenty to eight;7:45—fifteen(a quarter) to eight。(3)日常生活中的时间读法常常简化,直接按基数词的顺序读。如: 7:05—seven o five;7:15— seven fifteen时间类型 表示法 例 读法整点 基数词(+ o’clock) 1:00﹤30分钟 分钟 + past +小时 2:10= 30 分钟 half + past + 小时 3:30﹥30分钟 (60-分钟) + to +(小时 + 1) 4:40分钟逢15 即 一刻钟 a quarter 5:15 6:45简化法 按顺序读基数词 7:50表示在几点钟用介词 atone o’clockten past twohalf past threetwenty to fivea quarter past fivea quarter to sevenseven fifty一个半小时两个半小时two and a half hours= two hours and a halfone and a half hours= one hour and a half半的表示法1. The boy always stays there for ________.A. three and half hourB. three hour and a halfC. three and a half hoursC注意事项:(1) 基数词可以用来表示年级、班级、房间号码、电话号码和编号。并且单词开头字母要大写。例如:I am in Class Five, Grade Nine.(2) 基数词的单位hundred,thousand,million和billion等用来表示具体数目,前面有具体的基数词时,这些词的后面不加-s。例如:ten hundred;但是当hundred,thousand,million和billion等用来表示不具体的数目时用“hundreds/ thousands/millions/ billions of +名词”来表示,这些词的前面也不用具体的基数词。例如:hundreds of一般编码用 名词 + 基数词207房三年级一班第五部分第一课3 号汽车第一中学Room 207Class One Grade ThreePart five = the fifth partLesson one = the first lessonBus No.3 = the No.3 busNo. 1 Middle School编号的表示法1. There are ______ days in a year. A. three hundreds sixty-five B. three hundreds and sixty-fiveC. three hundred and sixty-five D. three hundred and sixty five2.______people visit this museum every day. A. Hundred B. Hundreds C. Hundred of D. Hundreds of3.____ trees have been planted in our school in the past 10 years. A. Thousands of B. Two thousands C. Thousand of D. Two thousand of4. Kate won the _______ race in the summer sports meeting. A. 100-metre B. 100-metres C. 100 metre D. 100 metre’s【综合练习】5.______of the students________boys in our class. A. One fifth; are B. One fifths; are C. First fifths; is D. One five; is6. He began to work there____.A. on his fifty B. at age of fifty C. when he fifty D. in his fifties7. We all like the_____ boy.A. of ten years old B. ten-year-old C. at ten old D. of age of ten8. There are____ months in a year. December is the____month of the year.A. twelve; twelve B. twelve; twelfth C. twelfth; twelve D. twelve; twelveth.【综合练习】Goodbye 展开更多...... 收起↑ 资源预览