初中英语语法数词教案(共2页).doc

精选优质文档-倾情为你奉上第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 thirty-four3、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 forty-three 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 twenty-five 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 hundred-metre race a five-pound 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。专心-专注-专业