1one,2two,3three,4four,5five,6six,7seven,8eight,9nine,10ten,11eleven,12twelve,

　　13thirteen,14fourteen,15fifteen,16sixteen,17seventeen,18eighteen,19nineteen,

　　20twenty,30thirty,40forty,50fifty,60sixty,70seventy,80eighty,90ninety,

　　100ahundred,1,000athousand,1,000,000amillion,1,000,000,000abillion.

　　基数词1-12是独立单词,需逐个记忆.基数词13-19是个位数词的词干后加-teen构成.其中thirteen,fifteen,eighteen,变化不规则.基数词20━90是在十位数词后面加-ty构成.基数词21━99是在十位数词后面加上个位数词合成,中间加上连字符"-".例如:

　　21twenty-one95ninety-five

　　基数词三位以上的数词,在百位和十位之间,一般要用连词"and".例如:

　　132onehundredandthirty-two.

　　1340onethousandthreehundredandforty

　　表示"万"的词英语中没有.如1万可用10千来表示.tenthousand.30万可用threehundredthousand来表示.