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、表語、賓語、定語、同位語、狀語等。如：

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

2.He was the first man to think of it.
2.他是第一個想到這一點的人。

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.前排第一個是準(zhǔn)？

5.Mrs. Brown was about to begin, but Jennie spoke first.
5.布朗夫人正要開始講話，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，因為前面兩個看上去小了點。

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)生來自那個國家。

14.Please give me a second chance.
14.請再給我一次機(jī)會。

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