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