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1、数词,什么是数词？,表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词，表示顺序的数词叫序数词。,基数词的构成与读法（1）0-12 如：zero one two three four five six seven eight nine ten eleven twelve(2)13-19都以-teen结尾，如：thirteen fourteen fifteen sixteen seventeen eighteen nineteen.(3)20-90十位数的整数都以-ty结尾，如:twenty thirty forty fifty sixty seventy ei
2、ghty ninety.,基数词的表示法,(4)21-99 的两位数，十位与个位之间用连字符“-”。twenty-one,thirty-two,forty-three,fifty-four,sixty-five,seventy-six,eighty-seven,ninety-eight(5)101-999 如：one hundred and one,two hundred and thirty nine hundred and ninety-nine,写出下列数字。,twelve,14,fourteen,20,twenty,40,forty,90,ninety,19,nineteen,35,t
3、hirty-five,78,seventy-eight,111,one hundred and twelve,234,two hundred and thirty-four,12,2.基数词表示时刻。（1）表示几点钟用基数词加oclock.例：7点 读作 seven oclock 5点 读作 five oclock(2)用”钟点数+分钟数“表示。例：7:10 seven ten 9:40 nine forty,(3)表示半点钟时，用“钟点数+thirty”或“half+past+钟点数”表示。例：2:30 two thirty/half past two 8:30 eighty thirty/
4、half past eighty分钟数在30分钟以内的，用“分钟数+past+钟点数”表示，意为“几点过几分”。例：7:10 ten past seven 10:15 fifteen past ten/a quarter past ten,(5)分钟数超过30分钟的，用“（60-分钟数）+to+下一个钟点数”表示，意为“差几分到几点”。例：10:40 twenty to eleven 2:45 fifteen to three/a quarter to three,练习：,用英语表示下列时间。10:05,ten past five,8:30,eight thirty,12:10,twelve
5、ten,1:15,one fifteen,5:47,thirteen to six,9:23,nine twenty-three,3:51,nine to four,11:49,eleven to twelve,6:00,six oclock,7:22,seven twenty-two,3.表示货币,基数词+货币单位（yuan/dollar/pound)注意：人民币yuan(元）没有复数形式 美元：dollardollars 英镑：pound pounds例：5元-five yuan 1美元-one dollar 7美元-seven dollars1英镑-one pound 9英镑-nine pounds,4.表示运算,例：3+4=7 three plus four equals seven 4-3=1 four minus three equals one,5.表示编号,Bus No.729,Room 8302,Class 3,Grade2,
