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(共35张PPT)
基数词和序数词
什么叫数词？
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。
基数词：表示数目多少的数词叫基数词。
序数词：表示顺序的数词叫序数词。
基数词（cardinal number)
1. one 11. eleven 20.twenty
2. two 12.twelve 30.thirty
3.three 13. thirteen 40.forty
4. four 14.fourteen 50.fifty
5 .five 15.fifteen 60.sixty
6 .six 16.sixteen 70.seventy
7. seven 17.seventeen 80.eighty
8. eight 18.eighteen 90.ninety
9. nine 19.nineteen 100.one hundred
10 .ten
基数词的构成
1）1-12，独立成词。
one two three four five six seven eight nine ten eleven twelve
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 60 -sixty 70- seventy
80-eighty 90-ninety
4)21-99,两位数，十位与个位之间有-
21 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
基数词三位数的构成
729→7 29
hundred
and
seven hundred and twenty -nine
再来一个
503→5 03
hundred
and
5 hundred and three
基数词三位数 的构成
百位数 hundred and 十/个位数
432
170
652
109
four hundred and thirty-two
one hundred and seventy
six hundred and fifty-two
one hundred and nine
practice
126 178
307 654
326 151
854 704
450 926
序数词（ordinal numeral）
1st
2nd
3rd
4th
5th
6th
8th
9th
12th
20th
21st
40th
100th
105th
129th
19th
倍数表达法—半的表达法
一个半小时 one and a half hours
=one hour and a half
两个半小时two and a half hours
= two hours and a half
Thank you

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