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.
Depending on context the plural form of brass can be brass or brasses.
The plural possessive form of "compass" is "compasses'".
The noun 'bronze' as a word for a type of metal is an uncountable noun for a substance.The plural form of the noun 'bronze' as a word for sculptures and statues made of bronze is bronzes.
To mix carbon with brass, the brass must be in molten form to form an alloy.
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."