内容正文:
聚焦考点☆温习理解
一、数词的定义及分类
表示数目与顺序的词,叫做数词。数词有两种:基数词和序数词。数词与不定代词相似,其用法相当于形容词或名词。可以在句中充当句子成分,如可用作主语、定语、宾语、介词宾语、表语、同位语或状语等。
二、基数词
表示数目的词是基数词,如one(一),two(二),thirty(三十)等。
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-ty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one hundred and four,486读作four hundred and eighty-six。
6. “万”的表达.英语中没有万和亿单词,只有百(hundred),千(thousand),百万(million),十亿(billion)。英语中表示“万”时,用10千。如:forty thousand四万。表示“亿”时需用百万来表示。如:two hundred million两亿。
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three billion,three hundred and thirty-three million, three hundred and thirty-three thousand,three hundred and thirty
8. hundred,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。
基数词的功能
(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)
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 millions 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:ten past ten, a quarter p