Roles is the plural of role.
The plural form of the noun soprano is sopranos.The plural possessive form is sopranos'.Example: The director rehearsed the sopranos' roles with them.
The possessive form of the plural noun sopranos is sopranos'.Example: The director expanded the sopranos' roles in the opera.
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 "is" is "are."
The plural form of "was" is "were."
The plural form of "I" is "we."
"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.
The plural form of the demonstrative pronoun 'that' is those.