Mary is a eleven-year-old girl.
表示順序的詞稱為序數詞。如first， second， third， fourth， ninth， twenty-first， forty-fifth等。
一、基數詞及其主要用法
This eleven-month-old baby can speak a few words.
He died in his fifties.
(Mary is eleven years old.)
two-thirds(2/3)，one-third(1/3)， nine-tenths (9/10)， five-twelfths(5/12)。
表示數目的詞稱基數詞。15 fifteen，僟百僟千不加s，242 two hundred and forty-two，5058 five thousand and fifty-eight，9，600，000 nine million six hundred thousand
I want three dozen of these.
Number six， line 4， page 19， Bus(No.) 332， Platform (No.) 5， Room 101
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The teacher asked us to write a four-thousand-word essay as our homework.
特殊表達法有：one half (1/2)，a quarter (1/4)， three quarters (3/4) .
7X5 = 35 Seven times five is thirty-five.
二、序數詞及其主要用法
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序數詞可以用來表示日期和世紀。May the first / the first of May (5.1) ， August the eighth / the eighth of August (8.8) ， the twentieth century， the twenty-first century
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The homework for the next period is to write a two-hundred-word composition about your hometown.
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6+8 = 14 Six plus eight is fourteen.
數詞部分需特別注意dozen,房屋修繕， hundred， million， billion 等詞。表示具體數字時，這些詞用單數形式，表示不具體的數字時，須用dozens of， hundreds of 這類的結搆。
When he sat down ， a fourth man rose to ask,台南代書借款.
1700 seventeen hundred
(There are four thousand words in the essay.)
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He has been there dozens of times.
4.基數詞可以用於編號,台北代書借款。
分數的分子用基數詞表示，分母用序數詞表示，若分子大於1，分母需用復數。
(The baby is eleven months old.)
基數詞可以和其他詞一起搆成合成形容詞，在句子中作定語，名詞不能加s.
A one-month-old baby can recognize its mother by smell.
8÷4 = 2 Eight divided by four is two.
1814 eighteen fourteen
Shall I ask him a third time,隆乳?