. Uncountable nouns have only one form. i.e., the singular form. Examples: Gold, water, air, tea, milk, fire etc. You don’t normally use a/an before an uncountable noun.
A list of uncountable nouns:
a) substances: water, air, iron, paper, plastic,
b) abstract ideas: life, progress, happiness, joy, fun, freedom, health
c) activities: work, travel, sleep, football, help,
d) feelings: love, hope, anger, hate, respect
These are the most tricky ones:
Uncountable only in the plural form
There is a group of nouns that have their meanings only in the plural form.