基数词应位于another,all之后,或位于such和more之前。e.g.another five months或five more months
表示几十的基数词的复数形式,可用来表示某人的岁数或年代。e.g.in one's twenties或in the 1920s
序数词前加不定冠词a/an,表示“再一,又一”e.g.Please give me a second chance.
序数词与名词构成的复合名词前不用定冠词。e.g.They are all second-raters.
在一些由序数词构成的固定词组中不用定冠词。at first;first of all
子主题序数词前已有指示代词、物主代词、名词所有格或every时,不用定冠词。Mother was my first teacher in my life.
在表示分数的序数词前不用定冠词。One fifth of the students here are from the country.
序数词用作副词的时候,前不加定冠词。He came first.