数词可分为基数词和序数词两种,其中序数词是表示事物的顺序,常常与定冠词the连用。如果序数词前有指示代词this、that或形容词性的物主代词my、your、her、its、our、their等限定词修饰时,不和the连用。eg:This is the firstday of aweek.这是一周的第一天。It is ourSeventhU Numerals can be divided into cardinal words and ordinal words, where ordinal words are the order of things and are often used in conjunction with the definite article the. If the ordinal word has modifiers such as my, your, her, its, our, its, etc. that are preceded by the demonstrative pronouns this, that, or adjectives, they are not used together with the. Eg:This is the firstday of aweek. This is the first day of the week. It is ourSeventhU