课件20张PPT。Unit7 Topic1
语法专项课件
(基数词和序数词)初中英语仁爱版七年级下册数词的分类数
词基数词 序数词数量顺序基数词定义及拼写表示数目的词称为基数词。其形式如下:
1)1-12, 独立成词。
one two three four five six seven
eight nine ten eleven twelve基数词定义及拼写2)13--19, 由3-9 + teen构成。
14–fourteen 16--sixteen 17--seventeen 19—nineteen
特殊拼写: 13– thirteen 15--fifteen 18—eighteen
3)20-90, 以-ty结尾。
20—twenty 30---thirty 40—forty 50—fifty 80---eighty
60---sixty 70---seventy 90—ninety 基数词定义及拼写4)21-99, 两位数,十位与个位之间有 “-”。
twenty-one
55 fifty-five
99 ninety-nine
5)101—999,三位数,百位与十位/个位之间加and。
101 one hundred and one
840 eight hundred and forty
693 six hundred and ninety-three基数词定义及拼写6) 1, 000以上数目,从右向左每三位用“,”分开,分别读为thousand , million, billion 29,43150076,,thousandhundredmillionbillionand序数词定义及结构表示数目的词称为基数词。其形式如下:
1) 1-3, first, second, third。
2) 4-19, 相应基数词+th,
特殊拼写:fifth, eighth, ninth, twelfth。
序数词定义及结构3) 20-90, y变成ie +th,如twentieth。
4) 21-99, 只把个位的基数词变成序数词
如twenty-first。
5) 序数词缩写 — 数字+最后两字母
如1st, 2nd, 3rd ,4th…序数词构成规律基变序,有规律,
一、二、三,特殊记,面目全非要注意,
加th从4起,
八少“t”,九去“e”,
“ve”要用“f”替,(five, twelve)
见“y”变成“i”和“e”,词尾加上“th”,
(twenty, thirty,……ninety)
若是遇到几十几,只变个位就可以。
序数词缩写记清楚,数字后跟两字母。易错点1表示具体数目,hundred, thousand, million不用复数。表示不确定数目,用复数。即hundreds of(数百),
thousands of(数千), millions of(数百万)+ 名词复数,
可以用many/several修饰,但不能与具体数目连用。特殊基数词的用法易错点11) Our country has a population of 1,300 million people.
2) There are three thousand students in our school.
3) After the war, thousands of people became homeless.
4) Several / Many thousands of trees must be planted every year.特殊基数词的用法易错点21.“基数词+名词” 的合成形容词作定语,中间有连字符“-”, 当中的名词用单数。
a 3 – year – old girl a seven-day holiday 2. 表计量 -- “基数词+度量单位+形容词”。
The classroom is 7 meters long, 6 meters wide
and 3 meters high.其他基数词的用法易错点31)顺读法----先时后分, “几点几分”
9:30 nine thirty 6:21 six twenty-one 基数词表示时间 易错点3表示时刻 2)逆读法----先分后时
表示“几点过几分”,半小时以内,介词用past
分钟数+past +钟点数
10:10 ten past ten 8:20 twenty past eight
表示“几点差几分”,半小时以上,介词用to
60减原分钟+ to + (下一个)钟点数
9:50 ten to ten 7:40 twenty to eight易错点3表示时刻 3) 15分钟:a quarter 30分钟:a half
9:15 a quarter past nine
12:30 half past twelve易错点4序数词的用法(1)序数词作定语,前面要加the。
The first truck is carrying a food basket.
John lives on the fifteenth floor.
She is my first English teacher.易错点4(2)有时加a/an,“再一”,“又一” 的意思
We’ll have to do it a second time.
Shall I ask him a third time?When I sat down, a fourth man rose to speak.
They had a second child in 1988.【典例1】Nine _______ pounds a week? That’s very good.
A. hundred of B. hundreds of
C. hundreds D. hundred考查数词。句意:一周九百英镑?那真不错。特殊数词前有“具体数字”时,特殊数词后边不加s。【典例2】The ______ letter in the word “birthday” is “i”.
A. two B. second C. three D. last考查数词。句意:birthday中的第二个字母是i。根据句意,可知“表顺序”,选用序数词,故答案为B。