Is there any milk in the bottle?为什么不用are呢?还有 There is some coffee on the table,too.明明是复数为何不用are?

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Is there any milk in the bottle?为什么不用are呢?
还有 There is some coffee on the table,too.明明是复数为何不用are?

milk , coffee, water, rice, meat 等都是物质名词,属不可数名词.
不可数名词做主语,谓语当然用单数了.
如:There is no water in the cup.
There is a bowl of rice on the table .
析:
物质名词不可数,所以需要一些表示量的名词短语或形容词来表达他们的量的多少.如,a piece of ... a cup of... 等
There is some coffee on the table, too. 桌上也有一些咖啡.
some 既可修饰可数名词,也可修饰不可数名词.
虽然从汉语思维的角度来看,是复数;
但从英语思维的角度来看,(some) coffee 不可数,所以谓语用单数.
注意:
There are two bowls of rice on the table.
析:
主语是:two bowls of rice 强调两碗的量
或者说主语中所修饰的中心词是bowls,所以谓语要用复数