不可数名词是指无法用数字一个一个地数出来的名词，叫做不可数名词。不可数名词没有单数与复数的区分。
1.不可数的名词
a.不可数名词在句子中一般被视为单数。比如：There is some water in the bottle.
Pass me some rice, please.
b.不可数名词前不能用a/an,但可以用the,比如：
The coffee tastes good.
the tea in the cup is for you.
c.表示一类事物的不可数名词在句中作主语时，谓物动词用单数形式，比如：
Iron is very hard.
Glass is an important material.玻璃是一种重要的材料。
d.表示两类以上事物的不可数名词作主语时，谓语动词用复数形式：
比如：Bread and milk are on the table.
Air and water are important to life.
