小学英语序数词ppt课件
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小学英语语法:基数词和序数词一.基数词(1)1-12 独立成词one two three four five six seven eight nineten eleven twelve(2)1-19 由3-9+teen构成14-fourteen 16-sixteen 17-seventeen 19-nineteen特殊拼写:13-thirteen 15-fifteen 18-eightteen(3)20-90整十位数以-ty结尾20-twenty 30-thirty 40-forty 50-fifty 80eighty60-sixty 70-seventy 90-ninety(4)21-99 两位数十位与各位之间有“-”21 twenty-one 55 fifty-five 99 ninety-nine(5)101-999 三位数百位于十位/各位之间加and101 one hundred and one840 eight hundred and forty693 six hundred and ninety-three二.序数词(1)1-3 first second third(2)4-19 相应基数+th,fourth,sixth,eleventh特殊拼写:fifth,eighth,ninth,twelfth(3)20-90 y变成ie+th 如twentieth thirtieth(4)21-99 只把各位的基数词变成序数词如twenty-first(5)序数词缩写——数字+最后字母如1st 2nd 3rd 4th(序数词构成规律)基变序有规律一、二、三特殊记面目全非要注意加th从4起八少“t”九去“e”“ve”要用“f”替(five,twelve)见“y”变成“i”和“e”词尾再加“th”(twenty,thirty,……ninety)若是遇到几十个只变各位就可以序数词缩写记清楚数字后跟两个字母8thone is never too old to learn!(活到老,学到老!)。