Mother was my first teacher in my life.妈妈是我生命中的第一个老师 。Tom is Lily's third boyfriend. 汤姆是莉莉的第三个男朋友 。
2.当表达分数时，序数词前不用 the 。One fifth of the students here are from the country. 这儿1/5的学生来自农村 。
Three fourths of the students here are from the country. 这儿的3/4的学生来自农村 。3.当表达“又一，再一”时，序数词前不用 the，但可加不定冠词 。
Please give me a second chance. 请再给我一次机会 。The poor woman had a third baby. 那个可怜的妇女又生了第三个宝宝 。
4.当表达“年月日”时，序数词前不用the 。He was born on June 6th, 1974. 他出生在1974年6月6日 。
5.当序数词在句中作状语时，序数词前不用 the 。Who got there second？ 谁第二个到那儿的？I finished the work first. 我最先完成那项工作 。
6. 当表达考试（赛跑等）中获得的名次时，序数词前不用 the 。She stands first in her class. 她在班上成绩排名第一 。
参考资料：序数词--百度百科 。
8.一到九十九的英语1-100都在这了：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 eighteen 19 nineteen 20 twenty 21 twenty-one 22 twenty- two 23 twenty- three 24 twenty- four 25 twenty- five 26 twenty- six 27 twenty- seven 28 twenty- eight 29 twenty- nine 30 thirty 31 thirty- one 32 thirty- two 33 thirty- three 34 thirty- four 35 thirty- five 36 thirty- six 37 thirty- seven 38 thirty- eight 39 thirty- nine 40 forty 41 forty- one 42 forty- two 43 forty- three 44 forty- four 45 forty- five 46 forty- six 47 forty- seven 48 forty- eight 49 forty- nine 50 fifty 51 fifty- one 52 fifty- two 53 fifty- three 54 fifty- four 55 fifty- five 56 fifty- six 57 fifty- seven 58 fifty- eight 59 fifty- nine 60 sixty 61 sixty- one 62 sixty- two 63 sixty- three 64 sixty- four 65 sixty- five 66 sixty- six 67 sixty- seven 68 sixty- eight 69 sixty- nine 70 seventy 71 seventy- one 72 seventy- two 73 seventy- three 74 seventy- four 75 seventy- five 76 seventy- six 77 seventy- seven 78 seventy- eight 79 seventy- nine 80 eighty 81 eighty- one 82 eighty- two 83 eighty- three 84 eighty- four 85 eighty- five 86 eighty- six 87 eighty- seven 88 eighty- eight 89 eighty- nine 90 ninety 91 ninety-one 92 ninety- two 93 ninety- three 94 ninety- four 95 ninety- five 96 ninety- six 97 ninety- seven 98 ninety- eight 99 ninety- nine 100 hundred 。
9.一到90怎么写用英语One to 90 how to write？哈哈
一到九：one.two.three.four.five.six.seven.eight.nine.
十到十九：ten.eleven.twelve.thirteen.fourteen.fifteen.sixteen.seventeen.eighteen.nineteen.
twenty.twenty-one.twenty-two,twenty-three 。..(twenty-加重负上面一到九)
30:thirty
40:fourty
50:fifty
60:sixty
70:seventy
80:eighty
90:ninety
100:one hundred
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