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