one1 two 2 three3 four4 five5 six 6 seven 7 eight 8 nine9 ten10 eleven 11 twelve 12
2.13~19的基數詞由3-9的基數詞加後綴- teen 構成。thirteen 13 fourteen 14 fifteen 15 sixteen 16 seventeen 1 7 eighteen 18rineteen 19
3.20~90的整十數都是以-ty結尾。twenty 20 thirty 30 forty 40 fifty 50 sixty 60 seventy 70 eighty 80 ninety 90
4.表示“幾十幾”時,在十位數與個位數之間加連字 符“_”。twenty- one 21
forty- five 45
seventy-eight 78
rinety-nine 99
5.三位數由“hundred and 末尾數”構成。a hundred and two 102
five hundred and twenty-six 526
6.千位數以上.的數字構成:從數字的右邊往左邊數。每三位數加一個逗号，從右往左第一個逗号讀作thousand,第二個逗号讀作million,第三個逗号讀作billion。
two billion three hundred and forty-five million two hundred and twelve thousand eight hundred and forty-one 2,345,212,841
二，序數詞的構成：1.第一、第二、第需特殊記憶:first, second, third。2.4~19的序數詞是由其相對應的某數詞後面加-th構成。eleven→eleventh 第十一
thirteen→thirteenth 第十二
注意:有4個詞拼寫不規則:
fifth(第五),eighth(第八), ninth(第九), twelfth(第十二)。
3.整十的序數詞由其對應的基數詞變結毛字母y為ie,再加-th構成:twenty→twentieth第20
fifty→fifieth第50
注意:ten的序數詞為tenth。
4.表示“第幾十幾”時，隻将個位數變為序數詞，十位數、百位數仍用基數詞。thirty- one→thirty- first 第31，
fifty- six→fifty-sixth第56.
5.序數詞的縮寫形式由阿拉伯數字加 序數詞的最後兩個字母構成。first→1st second→2nd third→3rd sixth→6th
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