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