The term 'paper sheet' is a countable noun. The plural form is paper sheets.
example: Nine paper sheets were attached to form one giant sheet.
The noun sheet is a countable noun. The plural form is sheets.
countable
The noun 'daytime' is an uncountable noun.
The noun skill is a countable noun; a skill or many skills.
The noun 'platform' is a countablenoun, the plural form is platforms (one platform, a number of platforms).
The noun sheet is a countable noun. The plural form is sheets.
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Shark is a countable noun.
Countable
countable
The noun 'daytime' is an uncountable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Countable
Pasta is a countable noun
The word 'violence' is an uncountable noun.