1.定語
Fifty thousand London dockers are out on strike.
2.主語
數(shù)詞作主語，謂語動詞用單數(shù)。
如： Two months is quite a long time.
Five is an odd number.
3.賓語或介詞賓語
How many do you want? -----Eight, please.
The city has a population of four million.
4.表語
We are altogether fourteen.
Five plus seven is twelve.
5.同位語
What work are you to assign us three?
Is there room for us two?
6.基數(shù)詞＋單數(shù)名詞＋形容詞構(gòu)成合成形容詞。如：一個五歲的男孩a five-year-old boy；一座800米長的橋an 800-metre-long bridge；女子400米接力girls'400-metre relay race。
7.句型：主語＋is ＋about(大約)／ over ＝more than(超過)／nearly(接近)＋具體數(shù)詞＋metre(s)／kilometre(s)／kilo(s)long ／ high ／tall ／deep ／away等。如：長江長6300公里。
The Changjiang River is 6，300 kilometres long.
8.表示“。。。。。。十”的數(shù)詞的復(fù)數(shù)形式可以用來表示人的歲數(shù)或年代：
He is in his early thirties.
He died still in his forties.
This took place in the 1930s.
(二)序數(shù)詞的基本用法
1.序數(shù)詞主要用作定語，前面一般要加定冠詞(或物主代詞)：
Tom is their second son.
They celebrated the 10th anniversary of the founding of the republic.
I will never give up, not even on the 1,000th or 10,000th try.
2.有時前面可以加一個不定冠詞來表示“再一”， “又一”這樣的意思：
We’ll have to do it a second time.
Shall I ask him a third time?
When I sat down, a fourth man rose to speak.
3.First,second 等有時可用來表示“第一個人(批)”“第二個人”等：
She was among the first to come and settle in Dujiashan.
You will be the second to speak.
4.如果數(shù)字較長，序數(shù)詞總避免使用，而且讀的也常常簡化：
第201房間： Room 201
第319面： page 319
第一拖拉機廠：the Number I Tractor Works
第六號車廂：Carriage No.6
南京路1490號：1490 Nanjing Road
電話號碼55??2347：telephone number : 55—2347
5. 在談編了號的東西時，我們可以用基數(shù)詞表示順序：
the first part------part one
the third squad------squad three
the twenty-third section----section twenty-three
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