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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.