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