1. 1~90的英文序数词怎么写 1到20为：
first、second、third、fourth、fifth、sixth、seventh、eighth、ninth、tenth、eleventh、twelfth、thirteenth、fourteenth、fifteenth、sixteenth、seventeenth、eighteenth、nineteenth、twentieth
21到40为：
twenty-first、twenty-second、twenty-third、twenty-fourth、twenty-fifth、twenty-sixth、twenty-seventh、twenty-eighth、twenty-ninth、thirtieth、thirty-first、thirty-second
thirty-third、thirty-fourth、thirty-fifth、thirty-sixth、thirty-seventh、thirty-eighth、thirty-ninth、fortieth
41到60为：
forty-first、forty-second、forty-third、forty-fourth、forty-fifth、forty-sixth、forty-seventh、forty-eighth、forty-ninth、fiftieth、fifty-first、fifty-second、fifty-third、fifty-fourth、fifty-fifth、fifty-sixth、fifty-seventh、fifty-eighth、fifty-ninth、sixtieth
61到80为：
sixty-first、sixty-second、sixty-third、sixty-fourth、sixty-fifth、sixty-sixth、sixty-seventh、sixty-eighth、sixty-ninth、seventieth、seventy-first、seventy-second、seventy-third
seventy-fourth、seventy-fifth、seventy-sixth、seventy-seventh、seventy-eighth、seventy-ninth、eightieth
81到99为：
eighty-first、eighty-second、eighty-third、eighty-fourth、eighty-fifth、eighty-sixth、eighty-seventh、eighty-eighth、eighty-ninth、ninetieth、ninety-first、ninety-second
ninety-third、ninety-fourth、ninety-fifth、ninety-sixth、ninety-seventh、ninety-eighth、ninety-ninth
扩展资料
在英语中，使用序数词时前面要加定冠词 the，但是，在下面的情况下则不加 the:
1.当序数词前有形容词性物主代词或名词所有格修饰时，序数词前不用 the 。
例句：Mother was my first teacher in my life.妈妈是我生命中的第一个老师 。
2.当表达分数时，序数词前不用 the 。
例句：One fifth of the students here are from the country. 这儿1/5的学生来自农村 。
序数词变化规则口诀：
1.基变序，有规律，词尾加上-th.
2.一，二，三，特殊记，词尾字母t,d,d.
3.八去t，九除e,ve要用f替，ty将y变成i,th前面有个e.
4.若是碰到几十几，前用基来后用序.
5.整十基数变序数，先把ty变成tie.
6.要是遇上2位数，十位基数，个位序，th最后加上去.
2. 1~90的序数词 第1 first第2 second第3 third第4 fourth第5 fifth第6 sixth第7 seventh第8 eighth第9 ninth第10 tenth第11 eleventh第12 twelfth第13 thirteenth第14 fourteenth第15 fifteenth第16 sixteenth第17 seventeenth第18 eighteenth第19 nineteenth第20 twentieth第21 twenty-first第22 twenty-second第23 twenty-third第24 twenty-fourth第25 twenty-fifth第26 twenty-sixth第27 twenty-seventh第28 twenty-eighth第29 twenty-ninth第30 thirtieth第31 thirty-first第32 thirty-second第33 thirty-third第34 thirty-fourth第35 thirty-fifth第36 thirty-sixth第37 thirty-seventh第38 thirty-eighth第39 thirty-ninth第40 fortieth第41 forty-first第42 forty-second第43 forty-third第44 forty-fourth第45 forty-fifth第46 forty-sixth第47 forty-seventh第48 forty-eighth第49 forty-ninth第50 fiftieth第51 fifty-first第52 fifty-second第53 fifty-third第54 fifty-fourth第55 fifty-fifth第56 fifty-sixth第57 fifty-seventh第58 fifty-eighth第59 fifty-ninth第60 sixtieth第61 sixty-first第62 sixty-second第63 sixty-third第54 sixty-fourth第65 sixty-fifth第66 sixty-sixth第67 sixty-seventh第68 sixty-eighth第69 sixty-ninth第70 seventieth第71 seventy-first第72 seventy-second第73 seventy-third第74 seventy-fourth第75 seventy-fifth第76 seventy-sixth第77 seventy-seventh第78 seventy-eighth第79 seventy-ninth第80 eightieth第81 eighty-first第82 eighty-second第83 eighty-third第84 eighty-fourth第85 eighty-fifth第86 eighty-sixth第87 eighty-seventh第88 eighty-eighth第89 eighty-ninth第90 ninetieth1-99的序数词记忆时可分为四个类 。
1、第一类first (1st) 第一second (2nd) 第二third (3rd) 第三（在括号里的是缩写形式，均在阿拉伯数字后面加上相应序数词的最后两个字母构成，以下各类与此相同 。）这类序数词只有三个，在整个序数词里面是特殊的，就和第一类基数词一样，需要逐个地硬记下来 。