初中英语复习语法知识点-数词
初中英语复习语法知识点-数词数词
定义：表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词;表示顺序的数词叫序数词。
I基数词
1.基数词的构成
(1)1-20
one,two,three,four,five,six,seven,eight,nine,ten,,,,,, , , , ,
(2)21-99 先说“几十”，再说“几”，中间加连字符。
23→-three,34→-four,45→forty—five,56→fifty-six,67→sixty-seven,78→-eight,89→-nine,91→-one
(3)101—999先说“几百”，再加and,再加末两位数或末位数;
586→fiveand -six,803→eightand three
(4)l,000以上,先从右往左数，每三位数加一个“,”,第一个“,”前为.第二个“,”前为
,第三个“,”前为(美式)或 ,(英式),然后一节一节地表示。
1,001→oneand one
9,785→nine , sevenand -five
18,423→ , fourand -three
6,260,309→sixtwoand sixtythreeand nine
750,000,000,000→sevenand fifty, (美式) sevenand fifty(英式)
2.基数词的用法
(1)作主语
eg.Four Of them come from Paris.
(2)作宾语
eg.一 How many books would you like?
一I would like two.
(3)作表语
eg.Seven minus two is five.
(4)作定语
eg.There are threein my ?
(5)作同位语
eg. You two will gowith us.
(6)表具体数字时,,,用单数。
eg. There are six in our grade.
(7)表不确定的数字时,数词用复数。若带名词，再加of。of(数百,成百上千的), of(数干,成千上万的), of(数百万)two(两千)
andofhavethe city.成千上万的人参观了这座城市。
6x5=30 Five times six is/sixfive is .
8÷2=4 Eightby two is four.
VI倍数表示法
a. 主语+谓语+倍数(或分数)+ as + adj. + as
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 (，…) of…
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…
The grainis 8 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
Theof grain has beenby four times this year.
今年粮食产量增加了4倍。
0.157 读作：(zero)point one five seven
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