Uncountable have no plural. you cannot say 'salts' 'airs' or sugars'.
Before uncountable nouns you can use determiner such as : the, some, any, much, this, his, etc. :
We cannot use indefinite article ( a/an) before an uncountable noun. So you cannot say 'a music', 'an air', 'a water'. We can use uncountable noun alone, with no article. Let's see the following examples.
Many nouns can be used as countable or as uncountable nouns. Usually there is a difference in meaning. Let's see the following example.
Some nouns are usually uncountable in English but often countable in other languages. Let's see the following examples.
Let's see their use in sentences.
In this exercise you have to choose the right word(s) in the bracket to complete the sentences given.