序數(shù)詞的用法

(1)序數(shù)詞作定語時，一般要與定冠詞或物主代詞連用。

eg.Tom is their second son.

He is the first one to come here.

(2)序數(shù)詞有時可與不定冠詞連用，表示數(shù)量上“又—”,“再一”

eg： He tried a second time.他又試了—次。

Shall l ask him a third time?還要我再問他—次嗎?我已問了他兩次)

(3)序數(shù)詞的縮寫形式為：阿拉伯?dāng)?shù)字加上這個詞的末尾兩個字母。

1st 2nd,3rd,4th,20th,21st,22nd,23rd

(4)表示年、月、日時，年用基數(shù)詞，日用序數(shù)詞。

2005年8月15日：(英)15,8,2005=15th,August,2005;(美)8,15,2005=August 15th,2005

III基數(shù)詞和序數(shù)詞都可以用來給數(shù)字編號

The first lesson=Lesson Two(第二課)

第305房間：Room three o(零)five

長安街76號：seventy-six Changan Street

電話號碼：204-2244：telephone number two o(零) four two two(double two four four

十一路公共汽車：Bus(No.) eleven

IV 詞的表達(dá)

分子用基數(shù)詞，分母用序數(shù)詞，分子大于1時，分母加s

eg.1/3-one third;2/5-two fifths

V數(shù)學(xué)運(yùn)算的表達(dá)

eg.3+5=8 Three plus/and five is eight.

9-2=7 Nine minus two is seven.

6x5=30 Five times six is thirty /six unutilized five is thirty.

8÷2=4 Eight divided by two is four.

VI倍數(shù)表示法

a. 主語+謂語+倍數(shù)(或分?jǐn)?shù))+ as + adj. + as

I have three times as many as you. 我有你三倍那么多。

b. 主語+謂語+倍數(shù)(分?jǐn)?shù))+ the size (amount，length…) of…

The earth is 49 times the size of the moon. 地球是月球的49倍。

c. 主語+謂語+倍數(shù)(分?jǐn)?shù))+ 形容詞(副詞)比較級+ than…

The grain output is 8 percent higher this year than that of last year.

今年比去年糧食產(chǎn)量增加8%。

d. 還可以用by+倍數(shù)，表示增加多少倍

The production of grain has been increased by four times this year.

今年糧食產(chǎn)量增加了4倍。

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