整百的序数词是hundredth， two hundredth， three hundredth， four hundredth， five hundredth， six hundredth， seven hundredth， eight hundredth， nine hundredth。
twenty ， thirty ， ninety 等以﹣ ty 结尾的基数词变为序数词，是将词尾的字母-y改为﹣ i ，再加-th。th 四加起，八减 t ，九去 e ，“ ve ”要由-f替，five ， twelve 是两兄弟。
0 zero 1 one 2 two 3 three 4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten 11 eleven 12 twelve 13 thirteen 14 fourteen 15 fifteen 16 sixteen 17 seventeen 18 eighteen19 nineteen 20 twenty 21 twenty-one 22 twenty-two 23 twenty-three 30 thirty 32 thirty-two 40 forty 50 fifty 60 sixty 70 seventy 80 eighty 90 ninety 100 one hundred 101 one hundred and one156 one hundred and fifty-six192 one hundred and ninty-two200 two hundred300 three hundred400 four hundred 500 five hundred 1，000 one thousand 1，001 one thousand and one。
My birthday is on May 2nd.我的生日是5月2日。the three girls' father 这三个女孩的父亲。the three children's father 这三个孩子的父亲。
