七年级上册Section A教案配套课件ppt

这是一份七年级上册Section A教案配套课件ppt，共13页。PPT课件主要包含了数词定义，基数词的构成，基数词的构成，基数词的构成口诀，基数词序数词对比，序数词的构成口诀，序数词缩写等内容，欢迎下载使用。

表示事物的数量和顺序的词,分为基数词和序数词两种。数词
表示数量:ne, tw, three
表示顺序:first, secnd,third 序数词前通常要加the。
基数词的构成
(1).数字1-12 没有规律 由ne到twelve12个各不相同的词表示。
0 zer 1 ne 2 tw 3 three 4 fur 5 five 6 six 7 seven 8 eight 9 nine 10 ten 11 eleven 12 twelve
(2).13-19均以后缀-teen结尾。
13 thirteen 14 furteen 15 fifteen 16 sixteen 17seventeen 18 eighteen 19 nineteen注意：thirteen，fifteen，eighteen
(3).20-90的整十数词均以后缀-ty结尾。
20 twenty 30 thirty 40 frty 50 fifty 60 sixty 70 seventy 80 eighty 90 ninety 注意：thirty，frty，fifty，eighty
hundred百ne hundred 100five hundred 500
基数词的构成
(4).21-99：表示“几十几”时, 十位和个位之间需加连词符 21 twenty-ne 32 thirty-tw 43 frty-three 54 fifty-five 65 sixty-five 76 seventy-six 87 eighty-seven 98 ninty-eight
找清规律很容易，十二以内词名异;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"百"，请你记住莫大意友情提示：注意-ty和-teen的发音哦！
基数词 序数词1 = ne 1st = first 2 = tw 2nd = secnd 3 = three 3rd = third 4 = fur 4th = furth 5 = five 5th = fifth
6 = six 6th = sixth 7 = seven 7th = seventh 8 = eight 8th = eighth 9 = nine 9th = ninth 10 = ten 10th = tenth
11 = eleven 11th = eleventh 12 = twelve 12th = twelfth 13 = thirteen 13th = thirteenth 21 = twenty-ne 21st = twenty-first 22 = twenty-tw 22nd = twenty-secnd
20 = twenty 20th = twentieth 30=thirty 30th=thirtieth 40=frty 40th=frtieth50=fifty 50th=fiftieth
“基”变“序”很容易，词尾加上 “th”;一二三无规律，理应单独来记忆。“八”减 “ t”、“九”去 “ e”、“f”来把 “ ve”、“二十” 到“九十”，“ty”变成“tie”若是遇到"几十几"，只变个位就可以。
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。 例如：first—1st; secnd—2nd; third—3rd; furth—4th; twentieth—20th; twenty-first—21st; twenty-secnd—2nd;twenty-third—23rd;1st, 2nd, 3rd为特殊形式, 其它的都是阿拉伯数字后加上th。
我有5本书。I have five bks.我们班有45个学生。There are frty-five sudents in ur class.我住在6楼。I live n the sixth flr.星期二是一个星期的第二天。Tuesday is the secnd day f the week.