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数词1.数词的类别基数词1-12词尾不固定one two three four five six seven eight nine ten eleven twelve 13-19词尾加teenthirteen fourteen fifteen sixteen seventeen eighteen nineteen20-90词尾加tytwenty thirty forty fifty sixty seventy eighty ninety单位词100：hundred 1,000 ：thousand 1,000,000 ：million1,000,000,000：billion序数词第1-第3，形式各异first (1st) second (2nd) third (3rd)第4-第19，基数词 + thfourth fifth sixth seventh eighth ninth tenth eleventh twelfththirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth第20-第90，变y为iethtwentieth thirtieth fortieth fiftieth sixtieth seventieth eightieth ninetieth只变个位基数词为序数词twenty-first thirty-second forty-third fifty-fourth sixty-fifth100th (one) hundredth 101th (one) hundred and first122th (one)hundred and twenty-second2.分数表达（1）分子基数词，分母序数词；分子大于一，分母加“s”；分母若是2和4,half, (a) quarter可代替。 eg; 1/4:one fourth / one quarter/ a quarter 3/4: three fourths/ three quarters 1/2: one / a half （不用one second） two and three fifths（2）分子和分母之间加in/ out of，分子在前，分母在后，分子分母都用基数词。 eg: 1/10:one in/ out of ten 5/8:five in/ out of eight3.倍数表达A is + 倍数/分数/百分数+ as + 形容词/副词的原级 + （as B ）A is + 倍数/分数/百分数+ 形容词/副词的比较级+ （than B ）A is + 倍数/分数/百分数+ the + 名词 + of B【注意】一倍：once 两倍：twice/double 3倍：3/4/5times4.hundred,thousand, dozen等1）与基数词及several, some, many, about, nearly, almost, over, around等连用时，均不加“s”；表泛指时加“s”.eg: hundreds of上百的 dozens of成打的2）与人称代词的宾格，定冠词，指示代词，形容词性物主代词，名词所有格连用时，加ofeg:hundred + n hundred + of + 定冠词+ n/指示代词+ n/代词宾格【注意】score of + n(of一般不可省略)5.可数名词及不可数名词的修饰语1）只修饰可数名词： many, a good / great many, many a, a (good/ large/ great ) number of, numbers of, few, a few, scores of, several, dozens of, scores of2）只修饰不可数名词：much,a little (of),a bit of,a great/good deal of,a large amount of, amounts of3)既可修饰可数名词，又可修饰不可数名词：a lot of, lots of, some, any, enough, plenty of, a large quantity/ supply of, large quantities of, supplies of , a mass of, masses of, all, more, most6.数字增减表示法by + 百分数/分数/数字（增加/减少了） to + 百分数/分数/数字（增加/减少到）2
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