The plural is aspirins.
The singular form of "aspirin" is "aspirin." It's one of those words where the singular and plural are the same!
Aspirin is acetylsalicylic acid. Consequently, it can act as a Lewis acid. Ammonia is a Lewis base. Therefore, ammonia and aspirin can react to form the ammonium salt of aspirin.
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."
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.