一般都是常作为不可数名词.没有遇到过可数名词的情况!
你可以看下,这些,
可数名词与不可数名词(Countable nouns and uncountable nouns)
a.可数名词有单、复数形式,单数形式可用a/ an; 不可数名词没有复数形式,单数形式前不用a/ an,但可用the或不用.例如：
Tom is a little boy.
There are 20 boys in our class.
Fish and poultry are usually not called meat.
I'll pay for the meat.
b.名词的数影响句子中与之有关的谓语动词、限定词等.例如：
There are many/ some/ a lot of/ (a) few people in the park.
There are not many/ any people in the park.
There is much/ some/ a lot of/ (a) little/ a great deal of/ a fair
amount of water.
There is not much/ any water.
c.下列名词常用作不可数名词：
accommodation,advice,baggage,behavior,bread,cash,cloth,clothing,coal,equipment,fun,furniture,grass,harm,information,ink,knowledge,labour,laughter,leisure,luck,lightning,living,luggage,machinery,meat,money,news,paper,permission,
popularity,progress,rice,scenery,soap,sugar,tea,traffic,travel,trouble,thunder,weather,work等.