题目内容
写出下面数词。
four hundred and eighty thousand and ninety-six
five billion four hundred million and sixty
掌握数词的用法非常重要，请做下面的练习，写出下列数词的序数词形式。
(1)one ________ two ________
three ________
(2)four ________ six
seven ________ ten
(3)five ________ twelve ________
(4)eight ________ nine ________
(5)twenty ________ thirty ________
forty ________ fifty ________
(6)sixty-one ________
seventy-two ________
eighty-three ________
ninety-five ________
one hundred and six ________
掌握数词的用法非常重要，请你写出数字1～30，并总结规律。
(1)________ (2)________ (3)________
(4)________ (5)________ (6)________
(7)________ (8)________ (9)________
(l0)________ (11)________ (12)________
(13)________ (14)________ (15)________
(16)________ (17)________ (18)________
(19)________ (20)________ (21)________
(22)________ (23)________ (24)________
(25)________ (26)________ (27)________
(28)________ (29)________ (30)________
你总结出数词1～30有什么规律了吗？下面我们一起总结一下。
(1)从13～19都是以teen结尾，均读做/ti:n/除thirteen，fifteen外，fourteen，sixteen，seventeen，nineteen均是在four，six，seven，nine后加-teen；eighteen因eight是以“t”结尾，故直接加-een.
(2)twenty，thirty均是以-ty结尾，读做/ti／。从21～29均是在twenty后加“-”连字符，one，two，three…nine直接跟后。
