Believe it or not, the proper noun Jell-O is an uncountable noun.
Jell-O is a single, individual product of one company, requiring no plural form.
The product Jell-O is an uncountable noun as a word for a substance. Units are expressed as boxes of Jell-O, flavors of Jell-O, dishes of Jell-O, etc.
Bridges is the plural form of bridge.
"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.
The plural of "she" is "they", so the plural of "she had" is "they had".
There is no plural form of pupae. Pupae is the plural form of pupa.
There is no plural, it is as it is. Its the same thing with sheep. You cannot say look at all the sheeps.
jellyfish is the plural and singular
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "was" is "were."
The plural form of "I" is "we."
The plural form of "is" is "are."
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
The plural form of the demonstrative pronoun 'that' is those.