Nouns ending in -a (often Latin or scientific) add -e to form the plural.
Mongolia is regular. It follows the -ae Addition rule.
Use plural verbs: "The mongoliae are ready" (not "is ready").
Yes. The plural mongoliae is standard across all English variants.
The word mongolia follows the standard English pluralization rule. When forming the plural, mongolia becomes mongoliae. This follows the -ae Addition pattern, which is one of the most common plural rules in English.
Understanding why mongolia becomes mongoliae helps with spelling and pronunciation. Nouns ending in -a (often Latin or scientific) add -e to form the plural.
When using mongoliae in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The mongoliae are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.