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