序數(shù)詞在句子中同樣可以做很多種成分，序數(shù)詞數(shù)詞在句中可用作主語(yǔ)、表語(yǔ)、賓語(yǔ)、定語(yǔ)、同位語(yǔ)、狀語(yǔ)等。如：

1.It’s said that 13 is an unlucky number.
1.據(jù)說(shuō)13是一個(gè)不吉利的數(shù)字。

2.He was the first man to think of it.
2.他是第一個(gè)想到這一點(diǎn)的人。

3.The town is 2,000 feet above sea level.
3.這座城市海拔2,000 英尺。

4.Who is that man, the first in the front row?
4.前排第一個(gè)是準(zhǔn)？

5.Mrs. Brown was about to begin, but Jennie spoke first.
5.布朗夫人正要開(kāi)始講話，珍妮先講了。

6.I want the third, because the first two look a bit small.
6.我想要第三個(gè)，因?yàn)榍懊鎯蓚€(gè)看上去小了點(diǎn)。

7.Tom is the third man that she was married to.
7.湯姆是她的第三任丈夫。

8.We are to carry out the first plan.
8.我們將要執(zhí)行第一套計(jì)劃。

9.I am the first in our class.
9.我是我們班第一名。

10.We'll go over it a second time.
10.我們將再次超越它。

11.We've tried it three times．Must we try it a fourth time?
11.我們已經(jīng)嘗試過(guò)三次了，還有必要嘗試第四次嗎？

12.Mother was my first teacher in my life.
12.媽媽是我生命中的第一位老師。

13.One fifth of the students here are from the country.
13.五分之一的學(xué)生來(lái)自那個(gè)國(guó)家。

14.Please give me a second chance.
14.請(qǐng)?jiān)俳o我一次機(jī)會(huì)。

15.He was born at the first Sunday of May.
15.他出生在五月的一個(gè)星期天。