【例如】There are some chickens in the yard.(院子里有几只鸡。)Would you like chicken or fish?(你喜欢吃鸡，还是吃鱼?)
物质名词或抽象名词一般是不可数的，但用来表示若干类和数量之多时，可转化为可数名词，但往往意义有所变化，如：water(水)→waters(水域)，sea(海)→seas(海域)
【再如】
Beer is a kind of nice drink in hot summer.
I had two beers and a big bowl of beef.
当抽象名词表示“某一种”或“某一方面”的抽象概念时，其前可加a/an.【例如】
What he did showed a certain honesty which made me admire him.
