it's too late and tomorrow is work day.you had better not st

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it's too late and tomorrow is work day.you had better not stay up为什么work day前面不加a呢?
可数名词的单数不都要加a吗?

Work day ：是指工作日.上班日.是专用名词.
专用名词是不用加a.
不加a的情况是叫做零冠词
零冠词(Zero articles )是指名词前面没有不定冠词( a、an )、定冠词( the ),也没有其他限定词的现象.零冠词也是是冠词的一种.
零冠词的用法如下：
　　1．表示抽象概括意义时,不可数名词和复数名词使用零冠词
2．专有名词通常使用零冠词
3．按照习惯下列各类名词使用零冠词;1）季节、月份、星期以及节假日（中国传统节日除外,详细请查阅“定冠词”）等名词前,2）三餐饭菜的名词,3）语言、运动、游戏等名词
4．在表示职位、头衔、身份等名词前
5.当by 与火车等交通工具连用,表示一种方式时,中间无冠词
6.有些个体名词不用冠词
7.中国乐器前面不加冠词
8..有些物质名词和抽象名词前永远用零冠词,即使有形容词,也用零冠词.常见的有：
　　（/）weather,（/）progress,（/）fun,（/）advise,（/）news,（/）information,（/）luck,（/）furniture,（/）wealth,（/）honesty 等.
9.在表示颜色和语言的名词前用零冠词
在这里是第二种用法.
以上回答供您参考!希望对您有所帮助!
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it's too late and tomorrow is work day.you had better not st It\'s too late.and you not go to bed It's too late.You'd better ( ) any more. A.not to sing B.not you'd better _______(not go) outside.it's too late the teacher had better not work day and night,_____ It's too late ,You'd better ______ stay up . It‘s too cold.You had better( )your coat. Are you going with us ? NO ,It is too late and ____ ,it's go You had better ___(not get) up too late in the morning You'd better stay here tonight.It's too late ;__,it's rainin it's not fair that you come home after a bad day at work and it‘s too late you'd better go to sleep _________