The word "legal" is an adjective. It stays the same whether it is modifying a singular or a plural noun.
The plural form for the noun arch is arches.
The noun 'fungi' is the plural form of the noun 'fungus'.
The plural form of inadvertence is inadvertences.
The plural form of itch is itches.
The plural of verandah is verandahs.
The plural form for the noun immovable is immovables.The plural form immovables is often used as legal terminology for real property.
The plural of the noun brief (a legal summary) is briefs.
Plural form of forum.
The plural form of the compound noun attorney general is attorneys general.The plural possessive form is attorneys general's.example: Are the attorneys general's qualifications the same in all states?
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.