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1、基数词的构成及用法构成一、基数词的构成1.1-12的表述1-12各有各的形式,即one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve。2.13-19的表述13-19的数字皆以-teen[ti:n]结尾,其中,fourteen,sixteen,seventeen,eighteen和nineteen分别由four,six,seven,eight,nine加后缀-teen变成的,eighteen中只保留一个t。thirteen,fifteen分别由three和five转花而来。3.20-90数字的表达20-90的数字皆以-t
2、y结尾,其中,sixty,seventy,eighty,ninety分别由six,seven,eight和nine加后缀—ty构成,eighty中只保留一个t。其他同上。4.20-99之间的数字的表达20-99之间的数词须在十位和个位之间加连字符“-”,如twenty-five。5.百位以上的数字的表达以及读在表达百位以上的数字时,必须在百位,十位和个位之间加and,在读音时也应读上and,如:104可表达为onehundredandfour,486读作fourhundredandeighty-six。6.“万”的表达.英语中没有万和亿单词,只有百(hundred),千(thousand)
3、,百万(million),十亿(billion)。英语中表示“万”时,用10千。如:fortythousand四万。表示“亿”时需用百万来表示。如:twohundredmillion两亿。7.7.1,000以上的数字,从后向前数。每三位数加“,”。第一个“,”前为thousand,第二个“,”前为million,第三个“,”前为billion.3,333,333,333读为threebillion,threehundredandthirty-threemillion,threehundredandthirty-threethousand,threehundredandthirty8.hun
4、dred,thousand,million前有若有具体数字时,要用单数形式,但如果他们后面有of,则要用复数形式。同时,前面不能再加具体的数目。二、基数词的用法 (1) 基数词在句中主要用作主语、宾语、定语、表语、同位语,例如: Thirty of them are Party members.(主语) --- How many would you like? --- Three ,please.(作宾语) The nine boys are from Tianjin.(定语) Six plus four is ten.(表语)
5、We four will go with you.(同位语) (2) 表示一个具体数字时,hundred, thousand, million不用复数;表示一个不确定数字时则用复数。例如: Our country has a population of 1,300 million people. There are three thousand students in our school. After the war, thousands of people became homeless. Maize is the most important food crop for milli
6、ons of people in the world. They arrived in twos and threes. (3) 表示“……十”的数词的复数形式可用来表示人的岁数或年代, 例如: He is in his early thirties. He died still in his forties. This took place in 1930s. (4) 表示时刻用基数词。例如:We get up at six. The workers begin work at eight. 表示“几点过几分,用past,但须在半小时以内。例如:tenpastten,aq
7、uarterpastnine,表示“几点差几分用to, 但分数须在半小时以上。例如:twenty to nine a quarter to ten 表示―几点几分 用基数词。例如:seven fifteen, eleven thirty, nine twenty 序数词的构成及用法 一、序数词的构成 1 第一,第二,第三分别为first,second,third. 2 第四到第十九都有相应的基数词加the构