Allergies
The plural of allergy is allergies
The Latin word for 'allergy' is 'allergia' ('allergiae', if plural).
The singular possessive of "allergy" is "allergy's." This form is used to indicate that something belongs to or is associated with an allergy, such as "allergy's symptoms" or "allergy's causes."
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."
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."