初中英语数词知识点：序数词在句中的用法

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　　序数词的用法
        　　①作主语   e.g. The third of the month was a holiday.
        　　②作表语   e.g. Who was the third?
        　　③作定语   e.g. We live on the fifth floor.
        　　④作宾语   e.g. I was among the first to learn of this.
        　　⑤作同位语 e.g. Who is that man, the first in the front row?
        　　⑥作状语    e.g. When did you first meet him?
        　　注：有时序数词并不指顺序，而是表示"再一，又一"的意思。此时序数词前要加不定冠词
        　　e.g. I want to make a second try.