R>⑤the+adj表示类别。如：the rich.

⑥年代，年龄的约数前常用the。如：in the 1950s,in his teens.

⑦表计量单位用the含有“每”、“每一”

It sells at two dollars the pound.

It sells 16 dollars to the pound.

John is paid by the hour.

⑧下列结构中的冠词。

-have+the+抽象名词+to do sth = be so +adj+ as to do sth

如：He has the politeness/kindness to say hello to me.

=He is so polite/kind as to say hello to me.

不用冠词的场合

抽象、物质、专有名，代词基数用作限定;

   泛指节假季节星期几，球棋、呼语与餐名;