beer作“啤酒”解时,通常是不可数名词; 但有时也可用作可数名词,表示“一杯或一种啤酒”。

He emptied the bottle of water and then filled it with beer.他把瓶子里的水倒了,然后装上啤酒。
They accused him for drinking beer while driving.他们指责他开车时喝啤酒。
He drank a pint of beer.他喝了一品脱啤酒。
He drank a glass of beer.他喝了一玻璃杯啤酒。
They finished the bottle of beer between them.他们两人把一瓶啤酒喝完了。
There is a glass for beer on the table.桌子上有只装啤酒的玻璃杯。
This beer is watery.这种啤酒很清淡。
We had several beers.我们有各种各样的啤酒。
They brew several excellent beers in this district.他们在这一地区酿造出好几种味道极好的啤酒。
I'd like a beer with ice.给我来一杯带冰的啤酒。
I'd like some beer with ice.我想喝点带冰的啤酒。