The plural form is challenges.
there isnt a plural form of a.
Arguments is in the plural form for the singular noun argument.
"Daffodils" is the plural of "daffodil."
The plural form is digits; the singular form is digit.
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 noun copper is an element. The adjective form means made of copper, or copper-colored.The noun "copper" meaning a copper coin (or slang for a policeman) would have the plural coppers.
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
Yes, "coin" is typically considered a countable noun rather than a mass noun. Each individual coin can be counted, making it a countable noun.
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.