Greek-derived nouns ending in -on change to -a in the plural form.
Don is regular. It follows the Greek -a rule.
Use plural verbs: "The da are ready" (not "is ready").
Yes. The plural da is standard across all English variants.
The word don follows the standard English pluralization rule. When forming the plural, don becomes da. This follows the Greek -a pattern, which is one of the most common plural rules in English.
Understanding why don becomes da helps with spelling and pronunciation. Greek-derived nouns ending in -on change to -a in the plural form.
When using da in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The da are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.