?用來(lái)表示多少和第幾的詞叫數(shù)詞。數(shù)詞可分為基數(shù)詞和序數(shù)詞兩類(lèi)。
1. 基數(shù)詞:用來(lái)表示多少的詞叫基數(shù)詞。
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
基數(shù)詞中沒(méi)有百、千的單位詞,用千(thousand)和百萬(wàn)(million)來(lái)表達(dá)數(shù)字。
1萬(wàn)=10 thousand 1億=100 million 10億=a thousand million= 1 billion
2. 基數(shù)詞的用法
①當(dāng)基數(shù)詞hundred, thousand, million和billion表示大量的確定的數(shù)目時(shí),不能在詞尾+s.
two hundred students 200個(gè)學(xué)生 five thousand years 5000年
②當(dāng)基數(shù)詞hundreds, thousands, millions和 billions表示大量的不確定的數(shù)目,后面+of。
hundreds of people 數(shù)以百計(jì)的人 thousands of trees 成千上萬(wàn)棵樹(shù)
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