The plural of toffee is toffees, but typically this plural would refer to more than one different kind of toffee. The singular can be an uncountable noun used to mean some or more than one piece, e,g. "would you like some toffee" (the same applies to fudge and taffy, but not to brownies or mints).
The plural of the variant "toffy" is toffies.
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
There is no plural form of pupae. Pupae is the plural form of pupa.
No, the plural form of jelly is jellies.
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."
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.
Trenches is the plural form.
The plural form is metres.