初中英语语法数词教案.doc
初中英语语法数词教案第3单元数词(一)基数词1、1100的构成onetwothreefourfivesixseveneightnineteneleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteentwentythirtyfortyfiftysixtyseventyeightyninetyone hundred2、3位数构成,例如234 读作:two hundred and thirtyfour3、hundred, thousand, million表示确切数目不加s如:three hundred people,但表示不确切数字时应加s,如thousands of stars4、千位以上的数,从个位向左数,每三位加一个“,”,第一个逗号前为thousand,第二个逗号前为million,第三个逗号前为billion,如7,543,812,应为seven million, five hundred and fortythree thousand, eight hundred and twelve.注意在百位数和十位数之间要用and连接。(二)序数词1、序数词构成注意first, second, third, fifth, ninth, twentieth, twenty-first, etc。的特殊形式。 2、序数词用于句中,它之前需加the,但有时用不定冠词a(an)表示“再一,又一”如 Try it a second time, please。 When I sit down, a third man came in。 (三)分数基数词代表分子,序数词代表分母.分子大于1时,分子的序数词用单数,分母序数词用复数。1/2one half or a half 1/4one fourth or a quarter 4/5 four fifths6 ,5/9 six and five ninths (四)时刻表达法225,two twenty-five or twentyfive past two 340,three forty or twenty to four (五)日期表达法2002年5月20日 May 20th, 2002, the twentieth of May, 2002注意:带有数词的名词作定语时,一般用单数形式a seven-year-old boya hundredmetre race a fivepound note (六)倍数表示法 A. 主语+谓语+倍数(或分数)+ as + adj. + as。例 I have three times as many as you。 我有你三倍那么多。B。 主语+谓语+倍数(分数)+ the size (amount,length) of。例 The earth is 49 times the size of the moon. 地球是月球的49倍。C. 主语+谓语+倍数(分数)+ 形容词(副词)比较级+ than。例 The grain output is 8 percent higher this year than that of last year. 今年比去年粮食产量增加8%。 D。 还可以用by+倍数,表示增加多少倍。例 The production of grain has been increased by four times this year。 今年粮食产量增加了4倍。