There is no plural form of nine. Nine is a number itself, which can describe something that there are nine of.
The plural form for the singular noun dot is dots.
The plural form for the noun memo is memos.
The plural is toothpastes.
Wizards is the plural form.
Much does not have a plural form.
The plural form of "do" is "do" and the plural form of "don't" is "don't." These words do not change in the plural form when used in a sentence.
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."
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.
"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 the demonstrative pronoun 'that' is those.
The plural form of "trench" is "trenches."
The plural form of "meter" is "meters."