1.基数词：
1-12 13-19 20-90 100-
1 one 13 thirteen 20 twenty 100 a hundred
2 two 14 fourteen 21 twenty-one 300 three hundred
3 three 15 fifteen 22 twenty-two 1,000 a thousand
4 four 16 sixteen 30 thirty 5,000 five thousand
5 five 17 seventeen 40 forty 1,000,000 a million
6 six 18 eighteen 50 fifty 1,000,000,000 a billion
7 seven 19 nineteen 60 sixty
8 eight 70 seventy
9 nine 80 eighty
10 ten 90 ninety
11 eleven
12 twelve
2.序数词：
1-10 11-19 20-90 100-
1 first 1st 11 eleventh 11th 20 twentieth 20th 100 one hundredth 100th
2 second 2nd 12 twelfth 12th 21 twenty-first 21st 103 one hundred and third 103rd
3 third 3rd 13 thirteenth 13th 30 thirtieth 30th 134 one hundred and thirty-fourth 134th
4 fourth 4th 14 fourteenth 14th 37 thirty-seventh 37th 200 two hundredth 200th
5 fifth 5th 15 fifteenth 15th 40 fortieth 40th 1000 one thousandth 1,000th
6 sixth 6th 16 sixteenth 16th 50 fiftieth 50th 1,000,000 one millionth 1,000,000th
7 seventh 7th 17 seventeenth 17th 60 sixtieth 60th 1,000,000,000 one billionth 1,000,000,000th
8 eighth 8th 18 eighteenth 18th 70 seventieth 70th
9 ninth 9th 19 nineteenth 19th 80 eightieth 80th
10 tenth 10th 90 ninetieth 90th
○1作主语：The first is better than the second .
○2 作宾语：He was among the first to arrive .
○3 作表语：He is the first to come to school .
○4 作定语：The ninth letter of the word "restaurant" is "n" ./ There are three thousand workers in the factory .
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