Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
Thirty is regular. It follows the -ied Conversion rule.
Use past time markers: "Yesterday, she thirtied to the store."
No. Use "did not thirty" (not "did not thirtied").
The verb thirty follows the standard English past tense conjugation rule. When forming the past tense, thirty becomes thirtied. This follows the -ied Conversion pattern, which is one of the most common conjugation rules in English.
Understanding why thirty becomes thirtied 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 thirtied 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 thirtied to the store." The past tense form does not change based on the subject — I thirtied, you thirtied, he/she thirtied, we thirtied, they thirtied.