sharpness
the possessive form of the plural noun comments is comments'.Example: His comments' sharpness took the lady by surprise.
No, the word sharpness is a common, abstract, uncountable noun, a word for the quality of a thing.I can't think of a use for the noun sharpness in the possessive form; I don't know what the quality of sharpness could posses. If there is a use for the possessive form, that would be: sharpness's.
The noun form of the adjective "sharp" is "sharpness." In grammar, when an adjective is used to describe a quality or characteristic of a noun, the noun form is often created by adding the suffix "-ness." In this case, "sharpness" refers to the quality of being sharp.
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.