课件14张PPT。初中英语数词归纳 ??在初中阶段,数词是中考必考的一个语法点。为了便于同学们系统地复习数词。现就初中阶段数词的主要内容作以下归纳。 数词包括基数词和序数词两大类。 数词Numeral
数词分为基数词序数词两大类。 一、基数词 1.1—12的基数词是独立的单词: one,two,three, four,five,six,seven,eight, nine,ten, eleven,twelve。 2.13—19的基数词以-teen结尾: fourteen,seventeen等,但13,15,18较特殊, 13—thirteen 15— fifteen 18—eighteen。 3.20—90的整十位均以-ty结尾: sixty,ninety,但20,30,40,50,80较特殊, 20—twenty 30— thirty 40—forty 50—fifty 80—eighty。
4.十位数与个位数之间要加连字符号“-” : 28—twenty-eight,96—ninety-six。
5.百位和十位(若无十位则和个位)之间加and: 148—one hundred and forty-eight 406—four hundred and six。
6.hundred(百),thousand(千),million(百 万),billion(十亿)等前面即使有具体的数词,也不能在它们的后面加s。
600 six hundred, 八百万 eight million7.1000以上的数字,从后往前数每三位加一个逗号“,”第一个逗号前为千(thousand),第二个逗号前为百万(million),第三个逗号前为billion(十亿)。489,762,981 2,510 84,296 274,3508.hundred,thousand,million用复数形式修饰名词时要用“of+复数名词” 数以百计的年轻人 hundreds of young people;数以千计的书 thousands of books。注意:hundreds of /thousands of/millions of +复数名词,其前面不能加具体的数词,但可加several或 many。Several hundreds of trees = several hundred trees several hundred of the trees (树中的几百棵)
9.基数词+单数名词+形容词构成合成形容词。 一个五岁的男孩 a five-year-old boy;
一座800米长的桥 an 800-metre-long bridge; 女子400米接力 girls’ 400-metre relay race。
10.句型:主语+is +about(大约)/ over =more than(超过)/nearly(接近)+具体数词+metre(s)/kilometre(s)/kilo(s)long / high /tall /deep /away等。
长江长6300公里。
The Changjiang River is 6,300 kilometres long注意:
four, fourteen, forty--- fourth, fourteenth, fortieth
nine, nineteen, ninety -- ninth, nineteenth, ninetieth
3.年月日的表示:
①年份用基数词,先读前一位或两位,再读后两位。 1999—nineteen ninety-nine;1900—nineteen hundred; 2000—two thousand;1905—nineteen o five;
②年用基数词,日用序数词:
1998年6月8日写作:June 8,1998;8 June, 1998
读作:June the 8th,1998; the 8th of June,1998
4.分数的表达:
①分子用基数词,分母用序数词,分子大于“1”,分母则加“s” :1/3 one third,2/3two thirds;
②1/2 a(one)half, 1/4 one fourth或a/one quarter, 3/4 threefourths或three quarters。
This box is five times as big as that one.
=This box is four times bigger than that one.
=This box is five times the size of that one.
5. first的用法: (1) 形容词:最初的,最早的
The first two lessons are difficult.
(2)名词:最初,第一;第一位。
Who is first?
(3)副词:最初,首先
He comes here first.
6. dozen(十二), score(二十) 的用法:
two dozen eggs 两打鸡蛋
dozens of eggs 几十个鸡蛋
three hundred and sixty-fivethousands ofTwo thirdsninthThreetwelfth7.Ann received a lot of presents on her ________ birthday.The twelve-year-old girl felt very happy
8.There are ______ students in our class, twenty boys and twenty girls.
9.Our teacher often tells us that work must come ______________.
10.At the beginning of the _________ (twenty) century,the world's population was about 1, 700 million. twelfthfortyfirsttwentieth