初中英语语法数词教案

2022-07-23 04:07:15   文档大全网     [ 字体: ] [ 阅读: ]

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数词,英语,语法,教案,初中
3单元 数词

(一)基数词 11100的构成

one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty thirty forty fifty sixty seventy eighty ninety one hundred

23位数构成,例如234 读作:two hundred and thirty-four 3hundred, 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,thousands of stars

4、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,7,543812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 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 225two twenty-five or twenty-five past two 340three forty or twenty to four (五)日期表达法

2002520 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 amountlength… 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。


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