在通常情况下,序数词前要用定冠词。如:
May is the fifth month. 5月是一年的第5个月。
That was the third time he had entered the house. 那是他第3次进入这座房子。
In came the first runner, closely followed by the second. 第一位赛跑者进来了,紧跟着第二位也进来了。
但是,如果序数词前使用了物主代词或所有格之类的修饰语,则不能使用定冠词。如:
That would be his third wife. 那也许是他的第3个妻子了。
I got my first bicycle two years ago. 两年前我买了第一辆自行车。
另外,如果不是表示特定的第几,而是表示数量或序数的增加,则其前用不定冠词。如:
We’ll have to do it a second time. 我们得再做一次。
Shall I ask her a third time? 我还要问她一次吗?
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