This verb follows the standard English past tense rule: simply add -ed to the base form.
Frontier is regular. It follows the Standard -ed rule.
Use past time markers: "Yesterday, she frontiered to the store."
No. Use "did not frontier" (not "did not frontiered").
The verb frontier follows the standard English past tense conjugation rule. When forming the past tense, frontier becomes frontiered. This follows the Standard -ed pattern, which is one of the most common conjugation rules in English.
Understanding why frontier becomes frontiered helps with spelling and pronunciation. This verb follows the standard English past tense rule: simply add -ed to the base form.
When using frontiered 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 frontiered to the store." The past tense form does not change based on the subject — I frontiered, you frontiered, he/she frontiered, we frontiered, they frontiered.