The plural form of the demonstrative pronoun 'that' is those.
The plural form of rung is rungs.
The plural form of parenthesis is parentheses.
The plural form of boy is boys.
"Important" is an adjective. It does not have a plural form.
Papillae
The renal papilla empties urine into the
Connective tissue papilla is a vascular process or form of connective tissue extending into and nourishing the root of a hair, feather, or developing tooth. Many skin papilla extend from the dermal layer into the epidermal layer.
lingual papillae
Bridges is the plural form of bridge.
Fungiform papilla are taste buds
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
"Groceries" is the plural form of "grocery."
The plural form of "meter" is "meters."
It has no plural form.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.