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基數(shù)詞 ：表示數(shù)目的詞稱為基數(shù)詞.其形式如下：　?。?）．從1——10 one,two,three,four,five,six,seven,eight,nine,ten． 　　（2）．從 11——19 eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen． 　　這里除 eleven,twelve,thirteen,fifteen,eighteen為特殊形式外,fourteen,sixteen,seventeen,nineteen都是由其個(gè)位數(shù)形式后添加后綴-teen構(gòu)成.　?。?）．從 20——99 整數(shù)幾十中除twenty,thirty,forty,fifty,eighty為特殊形式外,sixty,seventy,ninety都是其個(gè)位數(shù)形式后添加后綴-ty構(gòu)成.表示幾十幾時(shí),在幾十和個(gè)位基數(shù)詞形式之間添加連字符“-” 21 twenty-one 76 seventy-six 　　（4）．百位數(shù) 個(gè)數(shù)基數(shù)詞形式加“hundred”,表示幾百,在幾十幾與百位間加上and． 　　101 a hundred and one 320 three hundred and twenty 648 six hundred and forty-eight 　?。?）．千位數(shù)以上 從數(shù)字的右端向左端數(shù)起,每三位數(shù)加一個(gè)逗號(hào)“,”.從右開(kāi)始,第一個(gè)“,”前的數(shù)字后添加 thousand,第二個(gè)“,”前面的數(shù)字后添加 million,第三個(gè)“,”前的數(shù)字后添加 billion.然后一節(jié)一節(jié)分別表示,兩個(gè)逗號(hào)之間最大的數(shù)為百位數(shù)形式.　　2,648 two thousand six hundred and forty-eight 　　16,250,064 sixteen million two hundred and fifty thousand sixty-four 　　5,237,166,234 five billion,two hundred and thirty-seven million,one hundred and sixty-six thousand,two hundred and thirty-four