The noun 'offspring' has no plural form, it's a non-count noun.
The plural of progeny can be progeny or progenies.Like "offspring" progeny can refer to one person (child) or several (children).
Offspring refers to the young or progeny of an organism.
MuleExamples:A mule is the offspring of a male donkey and a female horse. (singular)All male mules and most female mules are infertile. (plural)
Nouns that have no singular are words that are a short form for 'a pair of', such as glasses or scissors; aggregate nouns such as police or accommodations; and nouns that are the same singular or plural, such as sheep or offspring.
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 "I" is "we."
The plural form of "was" is "were."
"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.