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1、Unit 7 Whats the highest mountain in the world?数词是用来表示事物的数目和顺序的词。数词是用来表示事物的数目和顺序的词。数词的分类：数词的分类：1.基数词基数词2.序数词序数词3.分数词分数词今天我们先来学习一下基数词。今天我们先来学习一下基数词。Grammar Focus(一一)数词数词 Numeral1.1.复习复习11001100以内的所有数字。以内的所有数字。2.2.掌握百、千、万、十万、百万的掌握百、千、万、十万、百万的表达法表达法。1、1-19的基数词 one 1 two 2 three 3 four 4 five 5 six 6 se
2、ven 7 eight 8 nine 9 ten 10 eleven 11 twelve 12 thirteen 13 fourteen 14 fifteen 15 sixteen 16 seventeen 17 eighteen 18 nineteen 192、2090等十位数twenty 20thirty 30forty 40fifty 50sixty 60seventy 70eighty 80ninety 90 twenty-one 21 twenty-two 22 其它的十位数照此类推，如：thirty-one 31 forty-two 42 seventy-five 75 ninet
3、y-six 963、百、千、万 百 hundred 100 one hundred 200 two hundred 以此类推 千 thousand 1 000 one thousand 2 000 two thousand英语里没有“万”这一单位，万也用thousand表示。如：10 000 ten thousand 一万20 000 twenty thousand 两万 4、十万、百万十万的说法是：100.000 a(one)hundred thousand 200.000 two hundred thousand million 百万 a(one)million 1,000,000 two
4、 million 2,000,000 以此类推 8,000,000 eight million确切数目与不确切数目的表达确切数目与不确切数目的表达：hundred,thousand,million,billion等前面有基数词，表示确切数目时，用单数，后直接接复数名词；如：three hundred books one hundred people five thousand students seven million starts1.The project lasted 5 years and cost 2 billion dollars.2.The Chinese have been m
5、aking paper for two thousand years.3.One thousand pounds is a lot of money.表示不确切数目时，这类词后加-s且与of连 用。如：hundreds of people thousands of students millions of birds billions of lions注意：这类短语中，名词前如有定冠词、指 示代词或形容词性物主代词时，可加of,但 表示的是范围。如：two hundred of the workers工人中的二百（人）多位基数词读法多位基数词读法457890608389three hundre
6、d and eighty-ninefour hundred and fifty-seveneight hundred and ninetysix hundred and eight 1）101999的的三三位位数数由由“百百位位数数and+两两位位数数组成组成”。如：如：325three hundred and twenty-five 102 one hundred and two635 six hundred and thirty-five2)三位数以上的数，从个位往前数，每三位数加一个逗号，从后往前数的第一个逗号代表thousand,第二个逗号代表million,第三个逗号是billion
7、，注意这几个词不能用复数形式，后也不能加and。例如：2,648 two thousand,six hundred and forty-eight 16,250,064 sixteen million,two hundred and fifty thousand,sixty-four 练一练练一练345100118,657,421three hundred and forty-fiveone thousand(and)oneeighteen million,six hundred and fifty-seven thousand,four hundred and twenty-oneHomework Practice with your classmates to speak and write large numbers.