八年级下册unit7sectionA3a-grammar focus.ppt

Unit 7 What’s the highest mountain in the world? eleven 11 twelve 12 thirteen 13 fourteen 14 fifteen 15 sixteen 16 seventeen 17 eighteen 18 nineteen 19 2、20—90等十位数 twenty 20 thirty 30 forty 40 fifty 50 sixty 60 seventy 70 eighty 80 ninety 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 ninety-six 96 3、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 million 2,000,000 ········以此类推 ······ 8,000,000 eight million 练一练 345 1001 18,657,421 three hundred and forty-five one thousand (and) one eighteen million, six hundred and fifty-seven thousand, four hundred and twenty-one 多位基数词读法 457 890 608 389 three hundred and eighty-nine four hundred and fifty-seven eight hundred and ninety six hundred and eight 1）101~999的三位数由“百位数＋and+两位数组成”。 如：325—three hundred and twenty-five 102 one hundred and two 635 six hundred and thirty-five 2)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，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 确切数目与不确切数目的表达：