Nouns used in their singular forms
In English there are nouns that are used only in the singular.
* see countable and uncountable nouns
other examples: luggage, jewellery
2. Some nouns ending in -s
other examples: athletics, billiards, crossroads, darts, economics, gymnastics, physics, mumps, politics, series
3. Special nouns
These nouns cannot normally be used in the plural but only in the singular. They are related to emotions and activity.
other examples: advice, damage, work