用来表示多少和第几的词叫数词。数词可分为基数词和序数词两类。
1. 基数词:用来表示多少的词叫基数词。
1 one 11 eleven 20 twenty 100 one hundred
2 two 12 twelve 30 thirty 1,000 one thousand
3 three 13 thirteen 40 forty 1,000,000 one million
4 four 14 fourteen 50 fifty 10,000,000 ten million
5 five 15 fifteen 60 sixty 100,000,000 one hundred million
6 six 16 sixteen 70 seventy 1,000,000,000 a billion
7 seven 17 seventeen 80 eighty
8 eight 18 eighteen 90 ninety
9 nine 19 nineteen
10 ten
①13-19 后面都是teen,20-90 后面都是ty.
② 35 → thirty-five 29 → twenty-nine
③179 → one hundred and seventy – nine 205 → two hundred and five
④5893→ five thousand eight hundred and ninety-three
基数词中没有百、千的单位词,用千(thousand)和百万(million)来表达数字。
1万=10 thousand 1亿=100 million 10亿=a thousand million= 1 billion
2. 基数词的用法
①当基数词hundred, thousand, million和billion表示大量的确定的数目时,不能在词尾+s.
two hundred students 200个学生 five thousand years 5000年
②当基数词hundreds, thousands, millions和 billions表示大量的不确定的数目,后面+of。
hundreds of people 数以百计的人 thousands of trees 成千上万棵树
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