Be verb before uncountable noun can only be is? There ___ is__ some milk in the cup. Article or numeral cannot be used directly before uncountable noun

Be verb before uncountable noun can only be is? There ___ is__ some milk in the cup. Article or numeral cannot be used directly before uncountable noun

You can't use indefinite (a, an) or specific numbers before uncountable nouns
But if you want to express the specific quantity, you can use the quantity structure: I want two pots of milk
A single uncountable noun has no plural form. The verb be can only be used as is