Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
Filly is regular. It follows the -ied Conversion rule.
Use past time markers: "Yesterday, she fillied to the store."
No. Use "did not filly" (not "did not fillied").
The verb filly follows the standard English past tense conjugation rule. When forming the past tense, filly becomes fillied. This follows the -ied Conversion pattern, which is one of the most common conjugation rules in English.
Understanding why filly becomes fillied helps with spelling and pronunciation. Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
When using fillied in writing, remember that it functions as a past tense verb and typically appears with time markers like yesterday, last week, or ago. For example: "Yesterday, she fillied to the store." The past tense form does not change based on the subject — I fillied, you fillied, he/she fillied, we fillied, they fillied.